Labia Major

hello.. this is causing me a lot of stress. I just started taking horseback riding lessons the other day (getting back into riding after about 5 years break) and i was finding it quite uncomfortable on my vagina, i wear a thong which might also have irritated it. Today it is still sore, and just now in the bathroom i see that my labia major is like chapped and raw and very sore! It almost looks deformed now and it is realllly scaring me!! It use to be quite smoothe and now its all lumpy i dont know what to do i really need some advice, will this go away or am i doomed to have ugly labia now! helpp!!!!!!