I Just Recently Found Out I Had A Bump On

I just recently found out I had a bump on my vagina. It's not actually in the vagina but at the entrance of. Every time I touch or apply pressure to it, it starts to sting. I have done some research of my own and found out that the bump could be caused by sweat. Since the warm weather started, I have been sweating down there. Everytime I get up to change class, there is sweat on the chair. So maybe the bump is from the sweat? If so, are there any home treatment I can do? or will It just go away on its own ? Also to add in, I am not sexually active