started with what I thought was a couple of flea bites, but has got to size of a silver dollar & it comes and goes. it comes on very fast by being itchy then if I itch it it get's sore. I rub hydrozole on it that clears it up fast but the scars stay until the next episode of it. I have noticed both my armpits look swollen, they aren't flat like they once were. I've had this problem for 2 years now...............