I go swimming and then after a couple of hours I get a round ring on my neck or on my ear I am not sure what it is but it goes all red and swollen and takes a week to go it happens every time I go swimming! Any ideas what it could be please let me know:(

Perhaps it's an allergy. Why is this a desperate situation? Does it spread, get infected?

It is contagious and can spread I am not sure what it it nor do the doctors

If Physicians who have seen the "rash" cannot diagnose it, those of us reading about it don't have a chance!

Find a second Physician and get another opinion.

You have been told it is contagious, it can spread - but no one knows what it is?

Sounds like a fungus like ringworm to me.