Butt sunburn HELP!..............?

i was tanning today and well i dont really like tan lines so i just wore a thong and now my butt is really sunburned! It hurts like crazy! There isnt any blisters its just hot pink so i dont think its anything serious but it hurts if i sit down for a long time and if i wear undies that arent made out of silk. My butt has never even seen the light of day before so im not very experienced with butt sunburns so what do i do?!