Alopecia areata may develop in the occipital scalp region and this is called alopecia areata ophiasis. When this happens the alopecia usually does not spread to affect other areas of the scalp. Unfortunately, development of alopecia areata ophiasis is associated with long term persistence and resistance to treatment. Alopecia areata may also develop at particular sites such as skin nevi. Nevi are spots of skin with properties different from surrounding skin.
Moles are the most common example.
Normally, alopecia areata is an acquired disease, that is it develops sometime after birth and after at least some hair growth. However, there are a few cases on record of babies being born with congenital alopecia areata. Disruption of growth may involve all of the nails or just one. Congenital alopecia areata. Trueb RM, Cavegn B. Trichotillomania in connection with alopecia areata.