My 18 yo son has lost a patch of hair that started about a month ago and has rapidly spread. It is square, started about the size of one sq inch and getting larger daily, right now it is about 3 sq inches. It is on the back of his head, lower right side. His usually thick hair is also thinning very fast. He has had a full blood workup done, which came back with hormone levels normal & nothing else showed up out of the ordinary. Dermatologist did an TSH thyroid test which also came back normal. She wants to give him a series of 3 steriod shots (into his head & body). She can't tell me what is causing this, (alopecia is a catch-all it seems) so it seems to me that she is treating the symtoms only. At this point, I don't trust her. I want to know what is causing this. I have considered a fungal infection or a parasite but I thought those things would have shown up in the original blood tests. What other tests can our GP, Internist run? Also, I would prefer to find a natural way to cure this if possible.