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Alopecia can be:Congenital - Acquired from birthGenetic - Inherited from parentsAcquired - Caused by some outside factorIatrogenic - Drug inducedCicatricial - Follicles destroyed by scarringPost natal - Following childbirthTraction - From continuous pullingAlopecia AreataA common condition, where normal hair growth is interspersed with totally bald, round or oval patches. It often begins in childhood and reoccurs throughout a person's lifetime, but rarely affects the elderly. In most cases, the condition is confined to one or two spots, but it can spread and become Alopecia Totalis where the entire scalp becomes bald. Alopecia Universalis is an even more distressing, but rare, condition where the hair is lost on the head, face and body.What causes Alopecia Areata The immune system, which fights off viruses, bacteria and foreign tissue, turns and attacks the hair follicles stopping hair growth. Although there isn't one specific cause, but there are number of theories: Trophoneurotic - Relating to nerve damage or change.Genetic Influences There is a genetic link with being prone to autoimmune diseases.It is produced by the combination of organic factors and genetically inherited by a dominant gene. Although this process begins to manifest early from the twenty years in men especially, is due to binding of the hormone testosterone present and produced in the male testicles with a protein in the skin known as the penta-alpha-reductase. Once testosterone binds to this protein produce a strong derivative known as dihydrotestosterone, which affects the hair and hair production especially in areas such as the crown and front of the head initially producing prominent front entrances and thinning hair with progressive loss occurs and then total loss of hair in these parts.