Unlike alopecia areata, this patchy alopecia occurs with scarring on the scalp. It can be congenital (present at birth); result from trauma, including burns, frostbite, injury, and radiation; or result from infection or inflammation. It may be associated with the pressure sores suffered by someone bedridden and unconscious or simply have no known cause.
Congenital Triangular Alopecia
This condition is often confused with alopecia areata. Congenital triangular alopecia is a patch of hair loss in the temple area. It is found mainly in children any time from birth to about five years. It’s nonprogresstve, noninflammatory, and nonscarring.
Loose Hair syndrome
Also known as loose anagen syndrome or loose anagen hair, this condition is noninflammatory and nonscarnng, and it most often affects children. It can be patchy or diffuse, and when it’s extensive, it affects the back of the scalp far more than the front. This may be from the back of the head rubbing against a pillow.
In this syndrome, hair is loose and easily pulls out of the follicles. The remaining hair doesn’t grow very long and can be unruly and hard to comb or style. This condition most often affects blond hair.
The affected hairs are still in the active growth phase, but their root sheaths, which normally surround and protect the hair shafts, aren’t produced properly in the follicles, so hair is poorly anchored. First identified in 1986, this condition can be genetic and run in families. It can improve on its own as an affected child ages, but if the condition doesn’t develop until the child is five years old or older, the hair loss will be more persistent.
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