Hair loss or baldness is the loss of hair from the head or body. Some types of baldness can be caused by alopecia areata, an autoimmune disorder. The extreme forms of alopecia areata are alopecia totalis, which involves the loss of all head hair, and alopecia universalis, which involves the loss of all hair from the head and the body.
Current evidence suggests that alopecia areata is caused by an abnormality in the immune system. This particular abnormality leads to autoimmunity, a misguided immune system that tends to attack its own body. As a result, the immune system attacks particular tissues of the body. In alopecia areata, for unknown reasons, the body's own immune system attacks the hair follicles and disrupts normal hair formation.
Three medications have evidence to support their use in male pattern hair loss: finasteride, dutasteride and minoxidil.
Various medications like Benzoyl peroxide, Antibiotics, Salicylic acid, Hormones, Oral and topical retinoids are used to treat acne.