My DS keeps getting a rash on his stomach

[Pinkchampagne]

It is always in the same area, near to his belly button.
I first noticed it after his pre school jab, and thought it was connected to that, but that was a few months back, and he still seems to get this rash quite often.
I guess it must be some kind of allergic reaction to something, but I have no idea what is causing it or how to get rid of it.
Any ideas?

I have a nickel allergy and in the past have got quite bad rashes around my belly button from the back of the metal buttons on my trousers, it gets worse in the heat. Not sure if this is likely to be the case with your DC though??

Heat rash?

Could be a nickel allergy I guess, as it is always around the belly button area where his buttons would be, but nowhere else. Hadn't thought of that.

Heat rash is another possibility, but he only seems to get it in the one area.