The Bottom Line

Scalp folliculitis is inflammation or infection of the hair follicles on the scalp. It can be caused by bacteria, fungi, or viruses, and ranges from minor surface pustules to deeper infections that need stronger treatment. Getting an accurate diagnosis matters — the type of folliculitis determines whether you need antibiotics, antifungals, or antivirals. Untreated severe cases can scar follicles and cause permanent hair loss.

What Is Scalp Folliculitis?

Your scalp contains thousands of hair follicles — tiny tube-shaped structures that anchor each hair and produce oil. When these follicles become infected or inflamed, the result is folliculitis: red, swollen bumps often filled with pus. The scalp is a particularly challenging location because the dense hair makes it harder for topical treatments to reach the skin, and the scalp's rich blood supply can allow infections to spread more readily.

Folliculitis ranges widely in severity. Superficial folliculitis only involves the surface of the follicle opening and usually clears without scarring. Deep folliculitis penetrates further into the follicle and surrounding skin; if it forms a boil or abscess, it can permanently damage the follicle and cause a small bald spot.

Signs and Symptoms

  • Clusters of small, inflamed bumps or pimples at the base of hair shafts
  • Pustules (bumps with a white or yellow pus-filled tip)
  • Itching, tenderness, or burning in affected areas
  • Crusting after pustules rupture
  • Deeper boils (furuncles) or large, painful lumps in severe cases
  • Patches of temporary hair loss over heavily affected areas

What Causes It — Four Main Types

Bacterial Folliculitis (Most Common)

Staphylococcus aureus causes 70–90% of bacterial scalp folliculitis. MRSA (methicillin-resistant Staph) is increasingly common in community settings and requires specific antibiotics. Risk factors include oily scalp, seborrheic dermatitis, tight hairstyles, scalp injuries, and diabetes.

Fungal (Malassezia) Folliculitis

The same yeast responsible for dandruff can also block and inflame hair follicles. Malassezia folliculitis tends to produce more uniform, itchy bumps and is often mistaken for bacterial infection. Antifungal shampoos containing ketoconazole 2%, selenium sulfide 2.5%, or zinc pyrithione work well for this type, with 70–80% response rates.

Viral Folliculitis

Herpes simplex and varicella-zoster viruses can infect follicles, producing painful blisters rather than simple pustules. This type requires antiviral medication and does not respond to antibiotics.

Inflammatory (Non-Infectious) Folliculitis

Some forms of scalp folliculitis have no infectious cause. Folliculitis decalvans and dissecting cellulitis of the scalp are severe inflammatory conditions that can lead to permanent scarring alopecia if not treated early and aggressively.

Diagnosis

A dermatologist can usually recognize folliculitis by its appearance. To confirm the cause, they may take a swab culture from a pustule. This identifies the bacteria or fungus involved and checks for antibiotic resistance. Scalp biopsy is used in complex or recurrent cases to look for inflammatory conditions. Knowing the exact cause is important — prescribing antibiotics for fungal or viral folliculitis will not help.

Treatment Options

Bacterial Folliculitis

  • Mild cases: topical antibiotics (mupirocin, clindamycin) + antiseptic washes
  • Moderate to severe: oral dicloxacillin or cephalexin 500 mg twice daily for 10–14 days (80–90% response)
  • MRSA: trimethoprim-sulfamethoxazole or doxycycline

Fungal Folliculitis

  • Ketoconazole 2%, selenium sulfide 2.5%, or zinc pyrithione shampoos twice weekly — leave on 5–10 minutes before rinsing
  • Stubborn cases: oral ketoconazole, itraconazole, or terbinafine for 2–4 weeks (80–90% response)

Viral Folliculitis

  • Acyclovir 400–800 mg multiple times daily for 7–10 days

Supportive Care for All Types

  • Avoid scratching or picking at lesions
  • Switch to loose hairstyles and breathable headwear
  • Keep the scalp clean and as dry as possible between washes

When to See a Dermatologist

  • Bumps are spreading, getting more painful, or not responding to over-the-counter treatments in 1–2 weeks
  • You develop a fever, fatigue, or swollen lymph nodes
  • A boil or draining abscess forms on the scalp
  • You notice permanent-looking bald patches developing
  • You have diabetes, take immunosuppressants, or have another condition that increases infection risk
  • You've had folliculitis repeatedly and want to find out why

Frequently Asked Questions

How do I know if my folliculitis is bacterial or fungal?

It's difficult to tell by appearance alone. Bacterial pustules are often randomly distributed and more deeply seated. Fungal folliculitis tends to produce more uniform, smaller bumps that respond to antifungal shampoo. The only reliable way to know is a culture test ordered by your dermatologist.

Will folliculitis cause permanent baldness?

Superficial or mild folliculitis causes only temporary hair shedding — hair regrows after the infection clears. Permanent hair loss only happens when deep infections or chronic inflammation scar the follicle. Prompt treatment is the best way to prevent this outcome.

Why does my folliculitis keep coming back?

Recurrent folliculitis usually means one of these: the initial infection was never fully cleared, an underlying scalp condition (like seborrheic dermatitis) keeps triggering new infections, a physical factor (tight braids, helmets) continuously traumatizes follicles, or the bacteria are resistant to the antibiotic used. A dermatologist can investigate and address the root cause.

Can folliculitis spread to other people?

Bacterial folliculitis can spread through shared combs, brushes, and towels, though this is uncommon in most households. Avoid sharing hair tools and wash pillowcases frequently during an active infection as a precaution.

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Trusted Resources

Always consult a board-certified dermatologist before starting or changing any treatment for scalp conditions.