Does alopecia areata cause bald patches?

Alopecia areata is an immune-related condition in which the body's defense system targets hair follicles. It can create one or more clearly defined, smooth areas of hair loss on the scalp, beard area, eyebrows, or other hair-bearing skin. The skin may look normal rather than scaly or inflamed. Some people notice short tapered hairs or small regrowing hairs within a patch, while others develop additional areas over time. Patchy loss can also follow traction, fungal infection, scarring conditions, or other medical causes, so the appearance alone cannot confirm the diagnosis.

Take a clear photo when you first notice a patch and note whether it is enlarging, multiplying, itchy, tender, scaly, or shedding hairs with an unusual shape. Avoid tight hairstyles, aggressive brushing, and scratching the area while you arrange an assessment. A dermatologist can examine the scalp and hair shafts, ask about recent illness, medicines, family history, and skin changes, and decide whether testing is needed. Treatment choices depend on the extent, location, duration, and activity of the hair loss.

Arrange a dermatology appointment if a bald patch is expanding, new patches appear, or hair loss returns after regrowth. Seek prompt medical advice when the area is painful, markedly red, swollen, crusted, draining, or associated with broken hairs and scaling, because those features can point to a different process. An assessment is also sensible when scalp hair loss occurs with eyebrow or eyelash loss, nail changes, or other new symptoms.

Could this pattern fit alopecia areata or another cause of patchy hair loss? What features will you check during the examination? Should I pause any hair products or hairstyles? What changes would mean I should contact you sooner? If treatment is recommended, when should I expect to review regrowth and side effects?