What Is Folliculitis?
Folliculitis is a condition in which one or more hair follicles become inflamed, typically due to bacterial or fungal infection, though physical trauma and chemical irritation can also trigger it. It presents as small red papules or pustules centered on follicles — resembling pimples — and can occur anywhere on the body where hair grows.
Folliculitis is one of the most common dermatological presentations worldwide. It is distinct from pseudofolliculitis barbae (razor bumps), which is mechanical in origin — though the two frequently co-occur and are sometimes confused because they look similar and share the same anatomical location.
Types of Folliculitis
Folliculitis is categorized by cause:
Bacterial folliculitis (most common) The bacteria Staphylococcus aureus is responsible for the majority of superficial folliculitis cases. It enters the follicle through a break in the skin — a shaving nick, an abrasion, or friction from tight clothing. The resulting pustule is typically small, yellow-tipped, and mildly tender. Superficial bacterial folliculitis usually resolves on its own within one to two weeks.
Pseudomonas folliculitis (hot tub folliculitis) Pseudomonas aeruginosa thrives in warm, under-chlorinated water. Exposure in hot tubs, pools, or water slides can lead to a distinctive rash of itchy red bumps appearing six to seventy-two hours after exposure, concentrated in areas covered by a swimsuit.
Pityrosporum (Malassezia) folliculitis A yeast species (Malassezia) that normally lives on skin can overgrow in hot, humid conditions or after antibiotic use. It produces chronic, itchy papules most often on the upper back, chest, and shoulders. Unlike bacterial folliculitis, it does not respond to antibacterial treatment and requires antifungal therapy.
Sycosis barbae A deeper, recurring form of bacterial folliculitis affecting the beard area (or bikini line in women), where the entire follicle, not just the surface, is involved. It produces large, painful papules that can lead to scarring if untreated.
Eosinophilic folliculitis An inflammatory type unrelated to infection, seen primarily in immunocompromised individuals. Requires medical evaluation and treatment.
Symptoms and Severity
| Presentation | Likely Type | Action |
|---|---|---|
| Small red papules or yellow pustules, mild itch or tenderness, recent shaving | Superficial bacterial folliculitis | Home care (antiseptic wash, warm compress) |
| Itchy rash 1–3 days after pool/hot tub | Pseudomonas folliculitis | Usually self-resolving; avoid source |
| Chronic itchy bumps on back or chest, unresponsive to antibiotics | Malassezia folliculitis | See a dermatologist; needs antifungal |
| Large, painful nodules, recurring | Sycosis barbae / deep folliculitis | Medical evaluation recommended |
| Any folliculitis in an immunocompromised individual | Potentially eosinophilic or atypical | Medical evaluation required |
Folliculitis vs. Razor Bumps: The Distinction
Both present as red papules at or near hair follicles, often after shaving. The key difference is cause:
- Folliculitis is primarily infectious — a pathogen enters the follicle.
- Razor bumps (pseudofolliculitis barbae) are mechanical — a cut hair re-enters the skin and triggers inflammation without infection.
In practice, the two frequently co-occur: a shaving-related nick provides the entry point for bacteria, leading to folliculitis on top of existing razor bump inflammation. Treatment overlaps partially (hygiene, reduced shaving frequency) but diverges at the pharmacological level — bacterial folliculitis may respond to topical antibiotics; pseudofolliculitis does not.
For a full breakdown of razor bumps specifically, see our razor bumps complete guide.
Home Care and Prevention
For mild, superficial bacterial folliculitis:
- Cleanse the area twice daily with a gentle antibacterial or benzoyl peroxide wash
- Apply warm compresses to bring pustules to a head
- Avoid shaving over active folliculitis until it resolves
- Wear loose, breathable clothing over affected areas
- Do not squeeze pustules — this can drive infection deeper
For prevention in shave-prone areas:
- Shave with a clean, sharp blade; dull blades drag and create micro-abrasions that invite bacterial entry
- Never share razors
- Use a fresh blade or clean cartridge — bacteria colonize blade edges between uses
- Shower before shaving when possible; warm water softens hair and opens pores
When to See a Doctor
Consult a healthcare provider if folliculitis is widespread, recurring despite home care, deepening into nodules or carbuncles, or not responding within two weeks of self-treatment. Prescription topical antibiotics (mupirocin, clindamycin) or oral antibiotics are effective for persistent bacterial cases; antifungals are required for Malassezia.
The Bottom Line
Folliculitis is inflammation of the hair follicle, most often caused by bacterial infection following skin trauma — including shaving. Superficial cases are common and usually self-resolving with basic hygiene. Persistent, widespread, or painful folliculitis warrants dermatological evaluation to confirm the cause and select the appropriate treatment. Prevention centers on clean shaving tools, adequate skin prep, and avoiding shaving over active lesions.