Name change, obviously 
As an early xmas present to all, please find attached a picture of my rashy, saggy arse. You're welcome! 
I would really appreciate any advice as to what this might be.
I've had it for about two years. It started out as a small, round patch of pink, dry skin. Over time, it has spread out and sort of healed (?) in the middle so it's now an outline of a circle. It is slightly raised, and not itchy, but it is sensitive (e.g. if I scratch my thigh and catch it with my nail it stings).
I usually douse it with Aveeno when I get out of the shower, but this doesn't seem to do very much. I've tried another moisturiser as well (well know dermatological one - can't remember name).
I am quite self conscious about it, and have recently found another patch of dry skin on my arm which I'm concerned is going to do the same thing but in a more visible place. Will go to the doctor's if need be but seems a minimal thing to go for.
Hope someone can help!