Hair loss occurs due to a functional or structural abnormality of the hair follicle. Hair follicles are part of the skin, so all hair loss disorders fall under the category of dermatology and should be seen in dermatology. The dermatologist will diagnose which type of alopecia areata is present based on the specific manifestations of hair loss, conduct relevant tests, and if concomitant systemic diseases are found, the patient will be advised to continue the consultation in the appropriate department.
For example, in a woman with androgenetic alopecia who also has menstrual disorders, the dermatologist will order tests to check sex hormone levels, and if there are abnormalities, the patient will be advised to go to a gynaecologist for further consultation.