Folliculitis Decalvans: Symptoms, Causes, and Treatment in the UK

Folliculitis decalvans is a chronic, inflammatory form of hair loss known as cicatricial alopecia (scarring alopecia). Unlike more common types of hair loss, such as male pattern baldness, this condition involves the permanent destruction of the hair follicle, which is replaced by scar tissue. It is most commonly seen in men, particularly during young adulthood and middle age.

The condition is characterised by the presence of painful, inflamed pustules (pus-filled bumps) around the hair follicles. As the inflammation progresses, it causes the hair to fall out. Because the follicle itself is scarred, the hair cannot grow back. One of the hallmark signs of folliculitis decalvans is 'tufted folliculitis', where several hairs emerge from a single dilated follicle opening, resembling the bristles of a toothbrush.

Identifying folliculitis decalvans early is critical to preserving as much hair as possible. Patients in the UK often report a cycle of flare-ups and remissions. Common symptoms include:

• Scalp Pain and Tenderness: The affected areas are often very sensitive to touch.
• Pustules and Crusting: Small, yellow pus-filled bumps appear around the hair shafts, which may burst and form thick, yellow-brown crusts.
• Itching and Burning: A persistent crawling or burning sensation is common.
• Scarring: Smooth, shiny patches of scalp where hair has been lost and the skin feels thin or tight.
• Tufting: Multiple hairs emerging from one spot, often surrounded by a ring of scales or redness.

While the scalp is the most common site, the condition can occasionally affect the beard area, armpits, or pubic hair.

The exact cause of folliculitis decalvans is not fully understood, but most clinical evidence and NHS guidance point to an abnormal immune response to a common bacterium called Staphylococcus aureus. While many people carry this bacteria on their skin without issue, those with folliculitis decalvans seem to have a heightened sensitivity or an impaired immune reaction to it.

The resulting inflammation is intense and deep-seated. As the body attempts to fight the perceived threat, the surrounding healthy tissue—specifically the hair follicle—is caught in the crossfire and destroyed. There is currently no evidence that the condition is contagious, nor is it related to poor hygiene or lifestyle choices.

Management of folliculitis decalvans according to NICE clinical pathways focuses on suppressing the inflammatory response and reducing the bacterial load. Because it is a chronic condition, long-term management is usually required.

Oral Antibiotics

The first line of treatment often involves long courses of oral antibiotics, such as tetracyclines or erythromycin. In more stubborn cases, a combination of rifampicin and clindamycin may be prescribed by a specialist dermatologist to clear the infection and dampen inflammation.

Topical Treatments

Antiseptic shampoos (containing chlorhexidine or selenium sulphide) can help reduce the amount of bacteria on the scalp. Strong topical steroid lotions or foams may also be used to reduce redness and swelling during a flare-up.

Advanced Therapies

For patients who do not respond to antibiotics, other options include oral retinoids (such as isotretinoin) or immunosuppressant medications. These require close monitoring and are usually managed within a secondary care (hospital) setting.

If you notice persistent, painful bumps on your scalp that are followed by hair loss, you should speak to a GP online as soon as possible. Because folliculitis decalvans leads to permanent scarring, waiting for symptoms to 'clear up on their own' can lead to irreversible bald patches.

An online GP consultation is a convenient way to discuss your symptoms, share photographs of the affected areas, and receive an initial assessment. A GP can provide:

• Advice on medicated shampoos and over-the-counter antiseptic washes.
• Prescriptions for initial antibiotic treatments if appropriate.
• Referrals to a dermatologist for a scalp biopsy or specialist management.
• Private sick notes if the pain or appearance of the condition is affecting your ability to work.

While medical treatment is essential, home care can help manage the discomfort of a flare-up. Patients are advised to avoid picking at crusts, as this can introduce secondary infections and worsen scarring. Using a silk pillowcase may reduce friction on the sensitive scalp, and washing the hair gently with lukewarm water rather than hot water can prevent further irritation.

It is also helpful to keep a 'flare-up diary' to identify if specific factors—such as stress or dietary changes—coincide with worsening symptoms, although medical triggers are usually more significant.