If you have been researching over-the-counter acne treatments, you have probably come across sulfur. It is not as heavily marketed as benzoyl peroxide or salicylic acid, but sulfur has been used to treat skin conditions for thousands of years — and it remains a staple in dermatology for good reason. Products like the popular De La Cruz sulfur ointment have introduced a new generation of acne sufferers to this ingredient, and the question keeps coming up: does sulfur actually help acne?

The short answer is yes, but with important caveats. Sulfur works through a distinct mechanism that makes it particularly well-suited for certain types of acne and certain skin types. It is gentler than many popular acne ingredients, which makes it appealing if your skin is sensitive or reactive. But it also has limitations, and understanding where sulfur fits in the broader landscape of acne treatment can help you decide whether it deserves a place in your routine.

This guide breaks down exactly what sulfur does for acne, the evidence behind it, which product types work best, and when you might need something stronger.

Quick Answer: Does Sulfur Help Acne?

Yes, sulfur is an effective over-the-counter acne treatment recognized by the FDA as an active ingredient for acne at concentrations of 3-10%. It works through keratolytic (exfoliating) and antimicrobial actions that address two key drivers of breakouts.

How sulfur helps acne:

  • Breaks down dead skin cells that clog pores (keratolytic effect)
  • Absorbs excess oil from the skin surface
  • Has antibacterial and antifungal properties
  • Reduces mild inflammation associated with breakouts

Best for: Mild to moderate acne, blackheads and whiteheads, oily skin, sensitive skin that cannot tolerate benzoyl peroxide or retinoids.

How Does Sulfur Help Acne? Mechanism of Action

To understand how sulfur helps acne, it helps to know how breakouts form. Acne develops when pores become blocked by a combination of dead skin cells, excess sebum (oil), and bacteria. These three factors create a feedback loop — clogged pores trap oil and bacteria, which triggers inflammation, which produces the red, swollen pimples, blackheads, and whiteheads that characterize acne.

Sulfur targets this process through several complementary mechanisms.

Keratolytic Action: Unclogging Pores

The most important thing sulfur does for acne is act as a keratolytic agent. This means it helps break down and shed the top layer of dead skin cells that accumulate on the skin's surface and inside pores. When these cells build up and mix with sebum, they form the plugs that cause comedones — the blackheads and whiteheads that are the foundation of most acne.

Sulfur promotes gentle exfoliation by weakening the bonds between corneocytes (the dead skin cells in the outermost layer of skin). According to a review published in Clinics in Dermatology, sulfur's keratolytic activity is well-established in dermatological literature and is the primary mechanism through which it treats acne and other hyperkeratotic skin conditions. This ongoing desquamation helps prevent the pore blockages that start the acne cascade.

Oil Absorption

Sulfur has natural drying and oil-absorbing properties. When applied topically, it helps draw excess sebum away from the skin surface. For people with oily or combination skin, this can reduce the greasy feel and shine that often accompany acne-prone skin, while also decreasing the amount of oil available to clog pores.

This drying effect is one reason sulfur works well in masks and leave-on spot treatments — it has time to absorb oil over the course of the application. However, the same property means sulfur can be over-drying for people with already dry or dehydrated skin.

Antibacterial and Antifungal Properties

Sulfur has inherent antimicrobial activity. When applied to the skin, it is reduced to hydrogen sulfide and pentathionic acid, both of which have antibacterial and antifungal effects. This helps control populations of Cutibacterium acnes — the bacteria that proliferates in clogged pores and contributes to inflammatory acne.

Sulfur's antifungal properties also make it useful for conditions that can mimic or coexist with acne, such as fungal acne (pityrosporum folliculitis). If your breakouts are caused by yeast overgrowth rather than bacteria, sulfur may be more effective than traditional antibacterial acne treatments.

Anti-Inflammatory Effects

While sulfur is not as potent an anti-inflammatory as ingredients like niacinamide or prescription topicals, it does have mild anti-inflammatory properties that can help reduce the redness and swelling associated with acne lesions. This contributes to its overall effectiveness as a calming, pore-clearing treatment.

What to expect: Sulfur works gradually rather than producing overnight results. Most people notice reduced oiliness within the first week, but meaningful clearing of breakouts typically takes 4-8 weeks of consistent use. Because sulfur is gentler than many acne actives, the improvement curve is slower but comes with less irritation and disruption to the skin barrier.

Types of Sulfur Acne Products

Sulfur is available in a range of over-the-counter product formats, each suited to different needs and preferences. The concentration of sulfur in acne products typically ranges from 3% to 10%, with the FDA classifying sulfur at these concentrations as an approved acne-fighting active ingredient.

Sulfur Masks

Sulfur masks are among the most popular sulfur acne products. You apply a thin layer to the face, leave it on for a set period (usually 10-20 minutes), and then rinse. Some can be left on overnight as a sleeping mask.

  • Best for: Weekly deep-cleaning treatments, managing oiliness, general pore maintenance
  • Advantages: Concentrated contact time allows sulfur to absorb oil and exfoliate effectively; easy to incorporate into an existing routine without daily commitment
  • Popular options: Peter Thomas Roth Therapeutic Sulfur Masque (10% sulfur), Sunday Riley Saturn Sulfur Acne Treatment Mask

Sulfur Spot Treatments

Spot treatments are designed to be applied directly to individual pimples rather than the entire face. They deliver a concentrated dose of sulfur to a specific area, helping dry out and flatten active breakouts.

  • Best for: Targeting individual pimples, people who do not want to treat their entire face with sulfur
  • Advantages: Precise application minimizes drying effects on surrounding skin; can be layered under moisturizer or makeup
  • Popular options: Kate Somerville EradiKate Daily Foaming Cleanser, Mario Badescu Drying Lotion (sulfur + calamine)

Sulfur Ointments

Sulfur ointments are thick, concentrated formulations that deliver a high dose of sulfur to the skin. The De La Cruz sulfur ointment is one of the most well-known and affordable options in this category, containing 10% precipitated sulfur in a simple ointment base.

  • Best for: People looking for a no-frills, high-concentration sulfur treatment at a budget-friendly price point
  • Advantages: High sulfur concentration, extremely affordable, can be used as a mask or overnight treatment
  • Considerations: The ointment base can feel heavy and may not be suitable for very oily skin; strong sulfur smell

Sulfur Cleansers and Washes

Sulfur-based cleansers and face washes incorporate sulfur into a daily-use formula. Because contact time is short (typically 1-2 minutes), the concentration of sulfur may need to be higher to deliver meaningful benefit.

  • Best for: People who want to incorporate sulfur into their daily routine with minimal extra steps
  • Advantages: Easy to use, less likely to cause excessive dryness since the product is rinsed off quickly
  • Considerations: Short contact time limits how much the sulfur can work; some formulations combine sulfur with sodium sulfacetamide (a prescription combination)

Prescription Sulfur Formulations

Dermatologists sometimes prescribe sulfur in combination with sodium sulfacetamide — a topical antibiotic. This combination (often at 5% sulfur / 10% sodium sulfacetamide) is more effective than sulfur alone because it pairs the keratolytic and oil-absorbing benefits of sulfur with the direct antibacterial action of the antibiotic. Products like Avar and Plexion are prescription examples of this combination.

What to expect: If you are using a sulfur product for the first time, start with a lower-concentration product (3-5%) or use a higher-concentration product less frequently (2-3 times per week). This gives your skin time to adjust and reduces the risk of excessive dryness or irritation. You can gradually increase frequency as your skin tolerates it.

Is Sulfur Good for Acne? What the Research Says

Sulfur has a long history in dermatology, and while it has not been studied as extensively in modern clinical trials as ingredients like benzoyl peroxide or retinoids, the evidence supporting its use is solid.

The FDA classifies sulfur (3-10%) as a Category I (safe and effective) active ingredient for acne treatment, placing it alongside benzoyl peroxide and salicylic acid as an approved over-the-counter acne treatment. This classification is based on decades of clinical use and established efficacy data.

A 2009 comparative study published in the Journal of Drugs in Dermatology examined a topical sodium sulfacetamide/sulfur formulation against benzoyl peroxide in patients with acne. Both treatments produced significant reductions in inflammatory and non-inflammatory lesions, but the sulfur combination was better tolerated with fewer reports of irritation, dryness, and peeling.

Research published in Clinics in Dermatology has characterized sulfur as a "tried and true" acne treatment, noting its keratolytic, antibacterial, and anti-inflammatory properties. The authors note that sulfur's mechanism of action — particularly its ability to promote desquamation and reduce comedone formation — makes it an effective treatment for both comedonal (blackheads and whiteheads) and mild inflammatory acne.

A 2010 study published in Cutis found that a sulfacetamide/sulfur cleanser used twice daily significantly reduced both inflammatory and non-inflammatory acne lesions over 12 weeks, with high patient satisfaction ratings and minimal side effects.

Sulfur vs. Other Acne Treatments

Understanding how sulfur compares to other popular acne-fighting ingredients can help you decide whether to use it on its own, in combination with other treatments, or whether a different ingredient might better suit your needs.

Factor Sulfur (3-10%) Benzoyl Peroxide (2.5-10%) Salicylic Acid (0.5-2%)
Primary action Keratolytic + oil absorption Antibacterial (kills C. acnes) Keratolytic (exfoliates inside pores)
Best acne type Blackheads, whiteheads, mild inflammatory Inflammatory acne (red, swollen pimples) Blackheads, whiteheads, clogged pores
Irritation potential Low to moderate (drying) Moderate to high (drying, peeling, redness) Low to moderate
Sensitive skin suitability Good Often problematic Generally good
Bleaches fabrics? No Yes No
Smell Noticeable (sulfur smell) Minimal Minimal
Fungal acne Effective (antifungal) Not effective May help (exfoliation)

One key advantage sulfur has over benzoyl peroxide is that it will not bleach your pillowcases, towels, or clothing. If you have ruined one too many shirts from a benzoyl peroxide product, sulfur is a fabric-safe alternative. You can read more about how benzoyl peroxide works in our benzoyl peroxide guide.

Compared to salicylic acid, sulfur has a similar keratolytic mechanism but adds oil-absorbing and antimicrobial properties. Some people find that combining sulfur and salicylic acid works well — using a salicylic acid cleanser daily and a sulfur mask weekly, for example — since the two ingredients attack pore-clogging from slightly different angles.

Who Should Use Sulfur for Acne?

Sulfur is not the most powerful acne treatment available, but it fills an important niche. It is particularly well-suited for certain people and certain types of breakouts.

Sulfur Works Best For

  • Mild to moderate comedonal acne: If your primary concern is blackheads, whiteheads, and clogged pores rather than deep, inflamed cysts, sulfur's keratolytic action targets these directly
  • Oily skin: Sulfur's oil-absorbing properties make it especially effective for people with excess sebum production
  • Sensitive skin: If benzoyl peroxide causes excessive irritation, redness, or peeling, sulfur offers a gentler alternative that still addresses acne
  • Fungal acne (pityrosporum folliculitis): Sulfur's antifungal properties make it one of the few over-the-counter ingredients that can address yeast-driven breakouts
  • People looking for a fabric-safe treatment: Unlike benzoyl peroxide, sulfur will not bleach your linens or clothing

Sulfur May Not Be Enough For

  • Moderate to severe inflammatory acne: Deep, painful, widespread breakouts usually require stronger prescription treatments
  • Cystic or nodular acne: These deeper lesions need systemic treatments that work from the inside out
  • Hormonal acne: If your breakouts are driven by hormonal fluctuations, topical sulfur does not address the underlying hormonal component. Our hormonal acne guide covers treatment options for this type of acne
  • Acne that has not responded to other OTC treatments: If multiple over-the-counter ingredients have failed, adding another OTC option is unlikely to be the breakthrough

Important: Sulfur has a characteristic smell that many people find unpleasant. Products like the De La Cruz sulfur ointment contain precipitated sulfur without added fragrance, so the natural sulfur odor is quite noticeable. If smell sensitivity is a concern for you, consider using sulfur products as a short-contact mask that you rinse off, or apply only at night.

How to Use Sulfur for Acne

Getting the best results from sulfur involves choosing the right product format, using it at the right frequency, and incorporating it wisely into your broader skincare routine.

Building a Routine with Sulfur

Here is a practical approach to incorporating sulfur into your skincare routine:

  1. Start slow: Begin with 2-3 uses per week, especially if you are using a leave-on product or high-concentration ointment. This allows your skin to adjust without becoming overly dry or irritated.
  2. Choose the right format: If you have oily skin across your whole face, a sulfur mask or wash may work well. If you get occasional pimples in specific areas, a spot treatment gives you targeted control without treating skin that does not need it.
  3. Follow with moisturizer: Sulfur is drying. Always follow a sulfur treatment with a non-comedogenic moisturizer to maintain your skin's barrier function. Look for lightweight, oil-free moisturizers if your skin is acne-prone.
  4. Use sunscreen daily: While sulfur itself is not photosensitizing the way retinoids are, maintaining sun protection is important for any acne-prone skin — especially if you are using other active ingredients alongside sulfur.
  5. Be cautious combining with other actives: Sulfur can be drying, and layering it with other drying or exfoliating ingredients (like retinoids or glycolic acid) at the same time can overwhelm your skin. If you use multiple actives, apply them at different times of day or on alternating days.

De La Cruz Sulfur Ointment: How to Use It

The De La Cruz sulfur ointment for acne is one of the most affordable and widely available sulfur products. It contains 10% precipitated sulfur in a simple ointment base. Here is how to get the most out of it:

  • As a mask: Apply a thin, even layer to clean skin. Leave on for 10-15 minutes, then rinse thoroughly with lukewarm water. Use 2-3 times per week.
  • As an overnight spot treatment: Dab a small amount directly onto individual pimples before bed. The high concentration works on the lesion while you sleep. Rinse off in the morning.
  • Patch test first: Apply a small amount to a discreet area (like behind the ear or along the jawline) and wait 24 hours to check for adverse reactions before applying to your whole face.

Red flag: If you experience severe redness, burning, swelling, or a rash after using a sulfur product, stop use immediately. While mild dryness and a slight tightness are normal, significant irritation may indicate an allergy or sensitivity to sulfur. People with a known sulfonamide (sulfa drug) allergy should speak with a healthcare provider before using topical sulfur, although cross-reactivity between sulfa drugs and elemental sulfur is extremely rare.

Sulfur and Other Acne Ingredients: Combination Strategies

Sulfur does not have to be used in isolation. Combining it strategically with other acne-fighting ingredients can produce better results than any single ingredient alone.

Combinations That Work Well

  • Sulfur + salicylic acid: Both are keratolytic agents that work on pore-clogging, but through slightly different mechanisms. Using a daily salicylic acid cleanser paired with a weekly sulfur mask covers both surface exfoliation and deeper pore clearing.
  • Sulfur + niacinamide: Niacinamide reduces inflammation, helps regulate oil production, and strengthens the skin barrier — all of which complement sulfur's drying and exfoliating effects. Use niacinamide in your daily routine and sulfur as a periodic treatment.
  • Sulfur + sodium sulfacetamide (prescription): This combination is one of the most well-studied sulfur formulations for acne. The antibiotic enhances sulfur's antibacterial action, and the pair is effective for inflammatory acne while remaining well-tolerated.

Combinations to Avoid (or Use Carefully)

  • Sulfur + benzoyl peroxide (at the same time): Both are drying agents, and using them together can severely dehydrate and irritate the skin. If you want to use both, apply them at different times — for example, benzoyl peroxide in the morning and sulfur at night.
  • Sulfur + retinoids (at the same time): Retinoids like tretinoin are potent exfoliants. Layering sulfur on top can strip the skin barrier and cause excessive peeling and sensitivity. Use on alternating nights if you want both in your routine.
  • Sulfur + AHAs/BHAs (at the same time): Stacking sulfur with glycolic acid, lactic acid, or high-concentration salicylic acid treatments can over-exfoliate. Space these out rather than applying them in the same session.

When Sulfur Is Not Enough: When to See a Dermatologist

Sulfur is a solid over-the-counter option for mild acne, but there are clear situations where it will not be sufficient on its own:

  • Your acne has not improved after 8-12 weeks of consistent sulfur use
  • You have deep, painful cysts or nodules that do not come to a head
  • Your breakouts are leaving dark marks or scars
  • Acne is spreading to your back, chest, or shoulders
  • Over-the-counter treatments (including sulfur, benzoyl peroxide, and salicylic acid) have not been enough
  • Your acne is significantly affecting your confidence or quality of life

When over-the-counter products fall short, prescription treatments offer significantly greater efficacy. Options like tretinoin, doxycycline, spironolactone, and isotretinoin (Accutane) address acne at a deeper level — targeting inflammation systemically, killing bacteria more effectively, regulating hormones, or shutting down oil production at the source. A dermatologist can evaluate your specific type and severity of acne and build a personalized treatment plan that goes beyond what any single over-the-counter ingredient can achieve.

What to expect: If you decide to see a dermatologist, our providers can evaluate your skin, review what you have already tried, and create a treatment plan tailored to your needs. Many patients are surprised by how quickly prescription treatments start working compared to over-the-counter products — tretinoin, for example, can begin showing results within 6-8 weeks. Same-day or next-day appointments are available.

The Bottom Line on Sulfur and Acne

Sulfur is a legitimate, time-tested acne treatment with a clear mechanism of action and FDA recognition as an over-the-counter acne-fighting ingredient. It works by exfoliating dead skin cells, absorbing excess oil, and providing antibacterial and antifungal activity — a combination that directly addresses how blackheads, whiteheads, and mild inflammatory acne form.

It is especially worth considering if you have sensitive skin that reacts poorly to benzoyl peroxide, if you are dealing with oily skin and comedonal acne, or if you suspect your breakouts may have a fungal component. Products like the De La Cruz sulfur ointment make it an accessible, budget-friendly option to try.

But sulfur has its limits. If your acne is moderate to severe, persistent despite over-the-counter treatments, or leaving scars, you need a treatment plan that goes deeper. A dermatologist can evaluate your skin, determine the underlying drivers of your breakouts, and prescribe treatments that target acne at a level that over-the-counter ingredients simply cannot reach.