For years now, I’ve had a brown blotchy skin rash around my neck. I have no idea what it’s from and my doctor just thinks it’s an allergy. But didn’t really seem confident. I have SUPER sensitive skin but you would think it’d go away SOMETIME, right? I don’t wear jewelry so it’s not from that. It also doesn’t hurt–it’s just ugly. Any ideas on what this is or how to get rid of it?