I hope this is the right place to put this as I couldn't find any other relevant section.

I've recently noticed some small ring shaped marks on my scalp which are brown-ish in colour with a normal skin colour in the center. They don't cause any irritation or pain but I never used to have them and am wondering if anyone knows what they might be, what causes them and possibly how to get rid of them.

Any comments would be appreciated.

Thanks