Hair Loss Guide
Alopecia areata in Japan — symptoms and treatment options
Understand what alopecia areata is, how it differs from AGA, and what treatment options are available in Japan for foreign residents.
What alopecia areata is
Alopecia areata is an autoimmune condition in which the immune system mistakenly attacks hair follicles, causing sudden patchy hair loss. It can affect the scalp, eyebrows, eyelashes, and other areas of the body. Unlike AGA, it is not caused by DHT or genetic hair follicle sensitivity. The condition can affect anyone at any age, and the extent varies from a single small patch to complete loss of scalp or body hair.
How it differs from AGA
AGA (androgenetic alopecia) causes gradual thinning along a predictable pattern driven by DHT — typically the temples and crown in men. Alopecia areata produces sudden, patchy, often circular areas of hair loss and is autoimmune in origin. The two conditions require different diagnoses and treatments. A dermatologist can usually distinguish between them during a scalp examination, and may recommend a blood test to rule out thyroid disease or nutritional deficiencies that can cause similar-looking hair loss.
Treatment approaches in Japan
Dermatology clinics in Japan treat alopecia areata using topical or injected corticosteroids and topical immunotherapy. In some cases oral medications such as JAK inhibitors may be discussed for severe cases. Treatment response varies by individual. Some patches regrow spontaneously, while others require ongoing treatment. The choice of treatment depends on the extent of hair loss, age, and response to prior treatment.
Seeing a dermatologist in Japan
Alopecia areata should usually be evaluated by a dermatologist before considering AGA medication or hair transplant options. In Japan, dermatology is typically covered by national health insurance, unlike AGA clinics which are private treatment. Foreign residents with Japanese health insurance can access dermatology at public or university hospitals. Confirm with the hospital whether English or Chinese interpretation is available if needed.
Hair transplant and alopecia areata
Hair transplant is generally not recommended for active alopecia areata because the autoimmune condition can attack transplanted follicles as well. Clinics will usually require that the condition has been stable and in remission for an extended period before considering any surgical option. If you have a history of alopecia areata and are also experiencing AGA-type hair loss, discuss this combination with a dermatologist before consulting a hair transplant clinic.