Could be ageing
Some people might experience the same thing. It seems (for what I can see in the pic) that is a natural process instead of special alopecia such as alopecia areata. Try pulling three times the hair in that area and see how many hairs end up in your hand. That should give us an...
Might be AA
Hello, Alopecia Areata is triggered by stress so you should check that out. Anyway it seems that the patch is shrinking and you should not worry since aa disappears spontanously.