In February I accidently used some expired sunscreen. Ever since then i've had this weird rash on my neck. The rash affects my neck and upper chest. It doesn't affect the middle of my neck though. The affected areas are dry and rough despite using moisturizer. They're also paler than the rest of skin. Its really itchy and very wrinkly. I'm only 16. What's wrong with my skin? What can I do about it?