My 4 year old son has had a rash on his ankle for a few months now. It doesnt bother him at all. It is red and raised and almost in the shape of a ring. The first time I saw it, I thought it was a rub mark from his sandals so I didnt think much of it.  It seems to kind of come and go, never fully disappearing though.
Thank you for following up. Your kid has allergic dermatitis local erythematous form. I suggest