Alopecia Areata is a type of hair loss that causes bald patches, usually in the scalp. It is thought to be an autoimmune condition (where the body's immune system mistakes a part of..
Male pattern hair loss (MPHL) is well understood and is influenced by a hormone called dihydrotestosterone, which can make the hair follicle smaller (miniaturisation) and affect..
Occasionally, the hair follicle structure can be destroyed by inflammation or trauma to the scalp. This results in the growing structure being replaced by scar tissue and permanent hair loss.
Hairs grow in a cycle with periods of growth (Anagen) than can last a number of years. When hairs reach the end the growing phase they regress (Catagen) and then rest for several months.