Sulfur in Skincare

What is sulfur?

Sulfur is a naturally occurring chemical element used in dermatology and acne products. It is also known as elemental sulfur, sulphur, and brimstone.^[1]

In the United States, FDA’s OTC acne monograph permits sulfur at 3% to 10% as the active ingredient in qualifying over-the-counter acne medications. Sulfur can also be used at 3% to 8% in specified combinations with resorcinol or resorcinol monoacetate.^[2]

That does not make every product containing sulfur an acne medicine. A qualifying OTC acne drug carries Drug Facts labeling and must meet the applicable monograph conditions.

What does sulfur do for skin?

Sulfur is used to treat acne and has keratolytic and antimicrobial activity.

Its keratolytic effect helps loosen excess surface buildup, while its antimicrobial activity contributes to its long-standing dermatologic use.^[3]

Under FDA’s OTC acne monograph, qualifying sulfur products can be labeled to treat acne and reduce acne pimples, blemishes, blackheads, and whiteheads.^[2]

Sulfur does not directly fade established post-acne marks, remove acne scars, regulate hormones, permanently shrink pores, or provide lasting oil control.

What the evidence says about sulfur skincare

Sulfur is well supported as an OTC acne treatment when it is used in qualifying 3% to 10% drug products that meet FDA monograph conditions.^[2]

The regulatory evidence is stronger than the modern sulfur-only clinical literature. FDA’s final monograph states that compliant OTC topical acne drug products are generally recognized as safe and effective and includes sulfur among the permitted active ingredients.^[2]

A Cochrane systematic review evaluated sulfur along with azelaic acid, salicylic acid, nicotinamide, zinc, and alpha hydroxy acids for acne. Across 49 trials and 3,880 reported participants, sulfur-specific evidence was sparse, and risk of bias and imprecision limited confidence in many comparisons.^[4]

The 2024 American Academy of Dermatology acne guideline gives strong recommendations to benzoyl peroxide and topical retinoids, among other established therapies. Sulfur does not receive equivalent guideline support.^[5]

A 2025 dermatology review also describes sulfur’s antimicrobial and keratolytic activity while emphasizing gaps in the modern evidence base.^[6]

For you, sulfur is a legitimate acne treatment, but it is not the best-studied first-line option. Its value is strongest when the format and tolerability fit your routine.

How sulfur form and formulation affect results

A sulfur cleanser, mask, cream, drying lotion, and spot treatment can behave very differently even when the headline percentage looks similar.

FDA permits 3% to 10% sulfur in qualifying standalone OTC acne medicines, but the monograph does not establish one ideal percentage.^[2] There is not strong modern evidence showing that 10% sulfur reliably outperforms 3% or 5% across current products.

Wash-off formulas provide shorter contact and may be easier to fit into a routine that already contains another leave-on acne treatment. Leave-on creams, masks, and spot treatments provide longer contact but can also increase dryness, odor, residue, or irritation.

Supporting ingredients matter. Clay, alcohol, salicylic acid, camphor, fragrance, and exfoliating acids can change how strongly a sulfur product feels and may contribute to irritation.

Combination medicines also need to be kept separate from standalone sulfur. Sodium sulfacetamide plus sulfur products contain an antibacterial sulfonamide drug in addition to sulfur, so their results and precautions cannot be attributed to sulfur alone.

Sulfur is also not the same as sulfates, sulfites, sulfonamides, sodium sulfacetamide, or selenium sulfide.

Who may benefit from sulfur skincare?

Sulfur can make sense when pimples, blackheads, whiteheads, or a small congested area are the main concern and you want another OTC acne option.

It may also suit you if you prefer a wash-off treatment or a targeted spot product rather than another leave-on acne layer.

Sulfur is not automatically gentler than benzoyl peroxide, salicylic acid, or retinoids. Tolerance depends on the strength, format, complete formula, and the rest of the routine.

If your acne is deep, painful, widespread, persistent, or leaving scars, do not rely on repeatedly stronger spot treatments instead of appropriate medical care.

Sulfur side effects and irritation risk

Sulfur acne products can cause dryness, peeling, redness, tightness, burning, itching, or irritation.

FDA’s OTC acne labeling warns that irritation and dryness are more likely when more than one topical acne medication is used at the same time. For sulfur products, the monograph also says not to use them on broken skin or large areas and to apply them only to areas with acne.^[2]

A strong smell, tight feeling, or visible residue does not prove the product is working better.

Do not automatically call new breakouts “purging.” Sulfur is not a retinoid, and worsening bumps can reflect irritation, another ingredient, or the underlying acne pattern.

Stop using a product that causes persistent burning, swelling, severe itching, blistering, or a worsening rash.

How to use sulfur in your skincare routine

Follow the directions for the exact product because cleansers, masks, spot treatments, and medicated creams use different contact times and frequencies.

For applicable leave-on OTC acne medicines, FDA labeling directs users to clean the skin, apply a thin layer to the affected area, and start with once-daily use before increasing only if needed and tolerated. If bothersome dryness or peeling develops, reduce frequency.^[2]

Rinse wash-off products after the labeled contact time. Leaving a sulfur mask on longer than directed has not been shown to improve results and can increase irritation.

Use moisturizer when needed. Adding moisture support is often more useful than trying to make a drying sulfur treatment feel stronger.

How long does sulfur take to work?

A sulfur spot product may make an individual surface-level pimple look or feel drier fairly quickly, especially when the formula also contains absorbent powders or other drying ingredients.

That short-term drying effect is not the same as preventing new acne. More meaningful acne improvement requires consistent treatment over time.

The modern sulfur-only evidence is not strong enough to promise a universal timeline. Claims such as “overnight cure,” “shrinks cysts,” or “eliminates hormonal acne” need credible finished-product evidence.

What can you use with sulfur?

Sulfur can appear in a routine that also includes benzoyl peroxide, salicylic acid, azelaic acid, or a retinoid, but using several drying treatments together can make irritation more likely.

If irritation develops, simplify. FDA’s OTC acne labeling warns that irritation and dryness are more likely when more than one topical acne medication is used at the same time.^[2]

Moisturizing ingredients such as glycerin, hyaluronic acid, ceramides, panthenol, and squalane can improve comfort.

A moisturizer cannot make an overly aggressive acne routine harmless. Reducing the number or frequency of irritating treatments may matter more than adding another hydrating step.

How to choose a sulfur product

First decide whether sulfur actually fills a gap in your acne routine.

If you want a wash-off option, look for a cleanser or mask with clear directions and a strength you can tolerate. If you want a targeted treatment, choose a spot product that does not overload the formula with alcohol, fragrance, acids, or other drying ingredients unless those additions serve a useful purpose for you.

Check whether the product is a properly labeled OTC acne medicine or simply a cosmetic containing sulfur. Drug Facts labeling gives you clearer information about the active concentration, acne claims, warnings, and directions.

Do not assume 10% is better than 3% or 5%. The evidence does not support using sulfur percentage as a performance ranking.

Also compare sulfur with better-studied acne options. Benzoyl peroxide and topical retinoids have stronger contemporary guideline support, while salicylic acid may be a more direct fit when clogged pores dominate.

“Maximum strength,” “detoxifying,” “oil absorbing,” and “pore purifying” do not prove better acne results. Sulfur alone also does not justify Premium or Luxury pricing.

Do you need a separate sulfur acne treatment?

Sometimes.

A separate sulfur product can make sense when acne remains a concern and a targeted or wash-off treatment fits your routine better than adding another stronger active.

Check whether you already use benzoyl peroxide, salicylic acid, a retinoid, azelaic acid, or a prescription acne treatment before adding sulfur. An extra drying step may create more irritation than benefit.

You are unlikely to need sulfur when acne is already controlled or when the main concern is established pigmentation, scarring, persistent redness, or facial scaling of uncertain cause.

The BB Perspective

Sulfur is a legitimate OTC acne medicine, but it is a secondary option rather than the best-supported first-line choice.

FDA’s monograph supports sulfur’s acne-treatment role at qualifying concentrations, while modern sulfur-only comparative trials remain limited. That is why regulatory support and contemporary evidence need to be read together.

Choose sulfur when the format solves a real problem and the formula is tolerable enough to use consistently. Do not pay extra for a stronger percentage or dramatic detox language that the evidence does not support.

Last reviewed: September 2026