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What is the signal that triggers alopecia areata to start or stop?

 

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A.
Current research suggests that something triggers the immune system to suppress the hair follicle. It isn't known what this trigger is, and whether it comes from outside the body like a virus, or from inside. Recent research indicates that some persons have genetic markers that increase both their susceptibility to develop alopecia areata, as well as the degree of disease severity.

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