Alopecia Areata
Alopecia areata is an autoimmune condition in which the immune system attacks hair follicles, causing them to shrink and halt hair production. It typically produces one or more smooth, round bald patches on the scalp, though it can affect the beard, eyebrows, eyelashes, or any other hair-bearing area. Hair follicles are not permanently destroyed, so regrowth is possible.
Key points
- Immune cells gather around the follicle base and trigger inflammation there, and the condition shares genetic links with thyroid disease.
- Because follicles survive rather than being destroyed, small patches that appeared recently often regrow on their own.
- A newer targeted medicine works differently, blocking the inflammatory pathway that damages follicles, though regrowth takes several months to show.
What drives the hair loss
The condition sits within the broader family of autoimmune support conditions. Immune cells, mainly T-lymphocytes, cluster around the follicle bulb and trigger inflammation. Genetic susceptibility is a strong factor; alopecia areata tends to cluster in families and shares genetic overlap with other autoimmune conditions such as thyroid disease and vitiligo. Emotional stress and viral illness are common reported triggers but are rarely the sole cause.
Treating alopecia areata
For years, treatment was limited mainly to corticosteroids. A more targeted option now exists: baricitinib, a JAK1/JAK2 inhibitor that damps the inflammatory signalling that attacks follicles. Clinical trials showed meaningful hair regrowth in adults with severe, long-standing alopecia areata. Results vary and response takes months, so realistic expectations matter.
If patches are small and have appeared recently, spontaneous regrowth is common without any treatment.