M.G.
OK, I don't have the whole story here but I'm going to throw in my 2 cents just in case.
My son is allergic to nickel. When he was an infant he had these weird little circles on his chest, the nurse at the doctors office said "maybe it's ringworm" this new mother was NOT happy about that comment!! Turns out he was reacting to the nickel in the snaps to the sleepers he was wearing to bed. I switched to Oshkosh brand sleepers and the problem went away. He still has a problem with belt buckles and those fun dog tags that people wear.
Just an idea.
M