Did you use a tanning activator? I have tanned in the past and when I used activator, I got this weird dry skin like rash on certain parts of my body. I have sensitive skin though also. I use a special dry skin lotion made by ShiKai and it helped heal it in a couple of days. Try using a lotion that moisturizes really well, one without all the smells, etc.(maybe Eucerin or something similar) If you use a lotions with lots of perfumes, etc, it will irritate it more. It sounds like your skin just got really dried out from the tanning, it happens.