<unk>  can occur at any age, and is currently believed to be an<unk> toimmune disorder, in which a person's immune system attacks the hair follicles. Genetic factors may contribute to<unk> , as about 20% of those affected have a family member with alopecia.
Alopecia universalis
Alopecia mucinosa
Alopecia totalis
Alopecia areata
Ichthyosis acquisita
Alopecia neoplastica
Abietic acid dermatitis
Tinea corporis