Sulfur for Acne: The Oldest Treatment Still Worth Trying

Sulfur is thousands of years old. Ancient Romans used it. Your dermatologist’s grandparents used it. And somehow, in 2026, with a skincare market that launches seventeen new “revolutionary” peptides per season, sulfur is still sitting quietly on the shelf — working.

That’s not nothing. Ingredients don’t survive millennia by being bad at their job.

If you’ve hit a wall with your acne routine, can’t tolerate benzoyl peroxide, or you’re pregnant and half your medicine cabinet is suddenly off-limits, sulfur deserves a serious second look. Here’s what it actually does, what to expect (yes, including the smell), and which formats work best.

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What Sulfur Actually Does to a Breakout

Sulfur is a keratolytic — it loosens and breaks down dead skin cells that would otherwise stick together and clog your pores. At the same time, it’s antimicrobial. It’s not as aggressive as benzoyl peroxide against C. acnes bacteria, but it hits the problem from two angles at once, which is why it works well on blackheads, whiteheads, and inflamed papules alike.

There’s a third thing sulfur does that doesn’t get talked about enough: it controls sebum. For anyone whose acne runs oily, that matters. It’s why sulfur products have historically been heavier and more paste-like — they’re absorbing oil as they work.

It’s also anti-inflammatory at concentrations between 3% and 10%, which is the clinically relevant range for most OTC products. Go below 3% and you’re probably not getting much. Above 10% and you’re pushing into territory that can genuinely irritate skin.

One thing sulfur does not do: it doesn’t exfoliate as cleanly as salicylic acid or the AHAs. If clogged pores are your main problem, you might still want a chemical exfoliant in your routine — sulfur pairs well alongside one rather than replacing it.

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The Smell. Let’s Just Get This Over With.

It smells like eggs. Specifically, like hard-boiled eggs that have been sitting in a warm room. This is non-negotiable. Sulfur’s active form is responsible for that odor, and it doesn’t go away just because a brand has added lavender or grapefruit extract to the formula.

Spot treatments are tolerable because the amount you’re using is small. A sulfur mask left on your face for ten minutes is a different experience — keep the windows open and maybe don’t do it right before a video call.

The smell dissipates once the product is rinsed or fully absorbed, so it’s not something that follows you around all day. But if you share a bathroom, fair warning: someone will notice.

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Masks vs. Spot Treatments: Which One You Need

Sulfur Masks

A sulfur mask — used one to three times a week as a leave-on for ten to twenty minutes — is the right format if you’re dealing with congestion across a larger area. Multiple whiteheads, a bumpy forehead, clogged chin. The mask applies a higher concentration over a bigger surface area, does its thing while you sit there, and rinses clean.

The Peter Thomas Roth Therapeutic Sulfur Acne Masque has 10% sulfur and is one of the more effective options available without a prescription. It’s thick and a little drying, which is the point.

If $52 feels steep for a mask, De La Cruz Sulfur Ointment has been around forever, costs about $9, and delivers 10% precipitated sulfur without any fuss. It’s not glamorous. The texture is dense and slightly waxy. But it works, and it’s frequently recommended by dermatologists who prioritize efficacy over packaging.

Sulfur Spot Treatments

For an individual blemish — the kind that shows up the night before something important — a sulfur spot treatment is what you want. Apply it directly to the spot before bed, leave it overnight, and you’ll typically see flattening and reduced redness by morning. Not magic. Just chemistry doing its job.

Mario Badescu Drying Lotion is probably the most famous sulfur spot treatment in existence. The concept is a little theatrical: it’s a two-layer formula, pink sediment at the bottom, clear liquid on top. You dip a cotton swab straight in without shaking and dab the pink sediment directly onto the blemish. Don’t shake the bottle. That’s the whole trick.

Does it work? Yes, reliably, on surface-level whiteheads. It’s 2% sulfur combined with salicylic acid and calamine, which is why it dries things down so fast. If you’ve got a deeper cystic blemish that hasn’t surfaced yet, it’s less impressive — but for a traditional whitehead, this is genuinely one of the faster options out there.

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Sulfur When You Can’t Use Benzoyl Peroxide

Benzoyl peroxide is effective, but it bleaches fabric, it can be very drying, and some people just can’t use it — their skin reacts badly and that’s that. If you’ve tried salicylic acid vs. benzoyl peroxide and found both irritating at effective concentrations, sulfur is the logical next step.

It’s gentler on the barrier than benzoyl peroxide. It doesn’t bleach your pillowcases. And it works through a different mechanism, so you’re not just using a weaker version of the same thing — you’re using something that approaches the problem differently.

That said, sulfur is not completely without risk of irritation. If your barrier is compromised, it can sting and flake. If you’re dealing with barrier burnout from overusing actives, let your skin recover first before adding sulfur to the mix.

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The Pregnancy Angle

This is actually significant. A lot of the heavy-hitter acne treatments are off the table during pregnancy — retinoids, high-concentration salicylic acid, oral antibiotics. That can leave people with very few options when breakouts flare (and they absolutely do, thanks to hormonal shifts in the first trimester especially).

Sulfur is generally considered pregnancy-compatible at OTC concentrations. It’s been used topically for long enough that there’s no meaningful evidence of harm, and it’s categorized as safe for external use by most OB guidance. That said: always run it by your doctor, especially if you’re using it across a large area frequently.

For a fuller picture of what’s safe to use during pregnancy, our pregnancy-safe glow routine breaks down the categories. Sulfur fits neatly into a simplified, safe routine alongside vitamin C and a gentle physical sunscreen.

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Sulfur for Rosacea: A Quieter Use Case

This one surprises people. Sulfur isn’t just for acne — it’s actually a recognized treatment for rosacea-type breakouts, particularly papulopustular rosacea, which is the subtype that looks like acne but isn’t.

The antimicrobial and anti-inflammatory properties both matter here. A lower concentration (3–5%) applied as part of a prescription sulfur-sodium sulfacetamide formula is a classic dermatologist go-to for rosacea that hasn’t responded to antibiotics alone. Over-the-counter sulfur products can help manage flares in milder cases.

One critical note: if you have rosacea, some of your instinctive acne-treatment habits will backfire. High-concentration benzoyl peroxide, harsh exfoliants, astringents — all of these can trigger a rosacea flare badly. Sulfur is a gentler entry point. Pair it with a rosacea-friendly routine and avoid anything that creates friction or heat on the skin.

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How to Work Sulfur Into Your Routine

A few practical notes:

Don’t layer it with active acids on the same night. If you’re using a salicylic acid toner or a retinoid, that’s enough for one evening. Use sulfur on a different night, or only as a spot treatment on top of a blemish rather than all over your face.

Moisturize after. Sulfur can be drying. That De La Cruz ointment especially — it’s dense and absorbing. Follow it up with a barrier-supportive moisturizer when you’re using it as a mask. You can skip that step if you’re spot-treating.

Use SPF the next morning, non-negotiably. Sulfur makes your skin slightly more vulnerable to UV exposure, particularly if you’re using it at higher concentrations regularly. If you’re also dealing with post-acne marks, unprotected sun exposure will make them darker and slower to fade. Our guide on UV memory and acne scars explains why that happens.

For a clean, acne-compatible SPF that won’t reblock your pores, EltaMD UV Clear is a reliable option — zinc oxide-based, no fragrance, works well over sulfur treatments.

Skin cycle it if you’re sensitive. You don’t need to use sulfur every night. Two to three times a week — as a mask or alternated with other actives — is often enough to see results without drying your skin out. If you’re not sure how to rotate your actives, skin cycling gives you a solid framework.

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What Sulfur Won’t Fix

To be clear about expectations: sulfur is not going to touch deep cystic acne. The kind that lives under your skin for two weeks, never comes to a head, and leaves a mark for months — that’s hormonal, structural stuff that needs a different approach. Look at hormonal acne treatment for that conversation.

Sulfur is also not a brightening treatment. It’ll help the blemish itself, but it won’t fade the post-inflammatory hyperpigmentation left behind. For that, you need a dedicated brightening ingredient layered in afterward — niacinamide, alpha arbutin, something like that.

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Putting It All Together

Sulfur survived thousands of years of skincare history because it does several things at once, gently, without requiring a prescription. Keratolytic, antimicrobial, sebum-absorbing. It’s a legitimate option for people who can’t use benzoyl peroxide, people who are pregnant, and people managing rosacea breakouts alongside acne-prone skin.

The smell is real. Commit to it or choose a spot treatment format where you’re using a tiny amount.

Start with a mask once or twice a week, or a spot treatment for individual blemishes. Keep the concentration between 3–10%. Moisturize after. SPF the next morning, every time.

It’s not exciting. It doesn’t have a serum texture or a celebrity behind it. But it works — and at $9 for the De La Cruz ointment, the barrier to trying it is essentially zero.