Sulfur for Acne Is Back: Why Dermatologists Recommend It
Why dermatologists are recommending sulfur again for acne and rosacea, how it compares to benzoyl peroxide, and when it may be a gentler alternative
Sulfur is a naturally occurring mineral with antibacterial, antifungal, and keratolytic (dead-skin-dissolving) properties that has been used to treat acne, rosacea, and seborrheic dermatitis since the 1950s. After decades of being overshadowed by benzoyl peroxide and retinoids, sulfur spot treatments are making a clinical comeback as dermatologists look for effective options that are gentler on sensitive and reactive skin 1.
Key takeaways
- Sulfur fights acne through three mechanisms: killing bacteria, reducing excess oil, and dissolving dead skin cells that clog pores 1
- Benzoyl peroxide is more potent against acne bacteria but causes significantly more irritation, dryness, and contact sensitization 2
- Sulfur-based treatments can address both bacterial acne and fungal folliculitis (Malassezia), something benzoyl peroxide cannot do 3
- Sodium sulfacetamide 10%/sulfur 5% formulations have proven effective for acne and rosacea with minimal side effects 4
- Recent benzene contamination concerns with benzoyl peroxide products have renewed interest in sulfur as an alternative 5
How does sulfur actually treat acne?
Sulfur works through a mechanism that is fundamentally different from most acne treatments. When sulfur particles contact your skin cells (keratinocytes), a chemical reaction produces hydrogen sulfide, which breaks down the bonds holding dead skin cells together 1. This keratolytic action unclogs pores from the inside out.
But sulfur does not stop at exfoliation. It also has direct antibacterial properties that reduce Cutibacterium acnes populations, and it curbs excess sebum production. That triple action, clearing dead skin, fighting bacteria, and controlling oil, makes it unusually versatile for a single ingredient.
The smaller the sulfur particles in a formulation, the more effective this reaction becomes. Modern manufacturing has solved the particle-size problem that made older sulfur products less consistent, which is a big part of why this ingredient is getting a second look.
Why are dermatologists choosing sulfur over benzoyl peroxide?
Benzoyl peroxide has been the go-to over-the-counter acne treatment for good reason: it is a powerful antibacterial agent that kills C. acnes through oxidation. But that power comes with tradeoffs that dermatologists are increasingly weighing against the alternatives.
About 2.5-5% of people who use benzoyl peroxide develop allergic contact sensitization 2. Irritant contact dermatitis is even more common, causing redness, peeling, and dryness that can be hard to distinguish from the acne itself. For patients with sensitive skin, rosacea, or compromised barriers, benzoyl peroxide can make things worse before they get better.
Sulfur-based treatments cause fewer adverse reactions. Side effects are mostly limited to mild, local irritation 1. That lower irritation profile makes sulfur a practical first choice for patients who cannot tolerate benzoyl peroxide, or who need an acne treatment that will not aggravate coexisting conditions like rosacea or perioral dermatitis.
Then there is the benzene question. In 2024, independent testing found that benzoyl peroxide products can form benzene, a known carcinogen, when stored at elevated temperatures 5. The clinical significance is still debated, and no increased blood benzene levels have been linked to topical use. But the finding has understandably pushed both doctors and patients toward alternatives.
| Sulfur | Benzoyl peroxide | |
|---|---|---|
| Mechanism | Keratolytic + antibacterial + sebum control | Oxidative antibacterial |
| Irritation risk | Low | Moderate to high |
| Contact allergy rate | Rare | 2.5-5% 2 |
| Works on fungal acne | Yes 3 | No |
| Bleaches fabrics | No | Yes |
| Safe during pregnancy | Generally considered safe 6 | Generally considered safe |
| Benzene formation risk | None | Documented at high temperatures 5 |
Can sulfur treat fungal acne too?
This is one of sulfur's biggest advantages. Fungal folliculitis, often called "fungal acne," is caused by Malassezia yeast and produces itchy, uniform bumps that look a lot like traditional acne. It is commonly misdiagnosed, and standard antibacterial acne treatments will not help 3.
Sulfur has documented antifungal activity against Malassezia species. That means a sulfur spot treatment can address both bacterial acne and fungal folliculitis without needing a separate antifungal product 1. If your breakouts are itchy, concentrated on your forehead, chest, or back, and not responding to typical acne treatments, fungal folliculitis could be the reason, and sulfur could be the answer.
The Skin Bliss Ingredient Compatibility Checker can help you verify whether your other products are Malassezia-safe, so you are not feeding the yeast with one product while fighting it with another.
What about sulfur for rosacea and sensitive skin?
Sodium sulfacetamide 10%/sulfur 5% formulations have been a dermatology staple for rosacea treatment since the mid-1950s. Clinical trials show they reduce inflammatory lesions by up to 80%, outperforming metronidazole 0.75% cream (which achieved 72% reduction) in head-to-head comparisons 4.
That dual use, treating both acne and rosacea, is unusual for a topical active. Most acne treatments are too harsh for rosacea-prone skin. Benzoyl peroxide, salicylic acid, and retinoids can all trigger rosacea flares. Sulfur manages to fight papules and pustules without provoking the underlying vascular sensitivity.
For people with sensitive skin who need an active treatment, sulfur fills a gap that few other ingredients can. It provides meaningful anti-inflammatory and antimicrobial effects at concentrations that most reactive skin types can tolerate.
What does the evidence say about sulfur's effectiveness?
The clinical data on sulfur is solid, if older. A Cochrane systematic review included sulfur among the topical treatments with evidence supporting efficacy for acne 7. Individual studies of sodium sulfacetamide/sulfur formulations show marked reduction in both inflammatory and comedonal acne lesions within 8 weeks of treatment 4.
One important caveat: most modern sulfur studies test combination formulations (sulfur + sodium sulfacetamide) rather than pure sulfur. Pure sulfur spot treatments you will find over the counter have less clinical trial data behind them, though the mechanistic evidence for sulfur's antibacterial and keratolytic effects is well established 1.
Sulfur concentrations in consumer products typically range from 3-10%. Higher concentrations are not necessarily better, especially for sensitive skin. Start with a lower percentage and work up if needed.
How should you use a sulfur spot treatment?
For spot treatment, apply a thin layer directly to active breakouts after cleansing and before moisturizer. Most formulations are designed for overnight use.
A few practical tips. Sulfur has a distinctive smell in older formulations, though modern products have largely solved this with better delivery systems. It can be mildly drying, so pair it with a non-comedogenic moisturizer. And while sulfur is generally well tolerated, patch test on your inner arm first if you have reactive skin.
Do not combine sulfur spot treatments with benzoyl peroxide at the same time and location. The combination can cause excessive dryness and irritation. If you are using other actives like retinoids or AHAs, stagger your application times.
FAQ
Is sulfur better than benzoyl peroxide for acne?
Neither is universally "better." Benzoyl peroxide is more potent against acne bacteria, but sulfur is gentler, works on fungal acne too, and causes less irritation. For sensitive skin or mild-to-moderate acne, sulfur is often the smarter starting point. For stubborn, bacteria-driven cystic acne, benzoyl peroxide may still be more effective.
Can I use sulfur if I am pregnant?
Topical sulfur is generally considered safe during pregnancy, and it has a long clinical history of use. However, always confirm with your OB-GYN or dermatologist, as they can evaluate your specific situation and recommend appropriate concentrations 6.
Does sulfur work on blackheads and whiteheads?
Yes. Sulfur's keratolytic action dissolves the dead skin cells that form comedones (blackheads and whiteheads). It may work more slowly than salicylic acid for this purpose, but it does so with less irritation.
Why does sulfur smell bad?
The hydrogen sulfide produced when sulfur interacts with your skin has a characteristic "rotten egg" scent. Modern formulations use smaller particle sizes and delivery systems that minimize this. Many current sulfur products have little to no noticeable odor.
Sources
- Gupta AK, Nicol K. (2004). "The use of sulfur in dermatology." *Journal of Drugs in Dermatology*.
- Leyden JJ, Kligman AM. (1977). "Contact sensitization to benzoyl peroxide." *Contact Dermatitis*.
- Rubenstein RM, Malerich SA. (2014). "Malassezia (pityrosporum) folliculitis." *Journal of Clinical and Aesthetic Dermatology*.
- Draelos ZD. (2010). "The multifunctionality of 10% sodium sulfacetamide, 5% sulfur emollient foam in the treatment of inflammatory facial dermatoses." *Journal of Drugs in Dermatology*.
- Almeter PJ, et al. (2024). "Evaluation of Benzene Presence and Formation in Benzoyl Peroxide Drug Products." *Environmental Health Perspectives*.
- Chien AL, et al. (2022). "Treatment of Acne Vulgaris During Pregnancy and Lactation: A Narrative Review." *Dermatology and Therapy*.
- Decker A, Graber EM. (2020). "Topical azelaic acid, salicylic acid, nicotinamide, sulphur, zinc and fruit acid (alpha-hydroxy acid) for acne." *Cochrane Database of Systematic Reviews*.
