had been? Three weeks ago, I went to Abercrombie, and I tried on some polos. As soon as I put one on, I felt really itchy on my armpits. When I got back home, I took off my shirt, and realized my armpits had a rash. For a week they were really itchy, then for the last 2 weeks, I had the rash, but there didn't itch anymore.

I never went to the doctor, what could it had been?