Infection?

(This is kinda gross and tmi but thats what this community is for i suppose) I've been going to band camp for 3 weeks and it is really hot outside, so my swimsuit area gets all gross and I can't shower until like 5 pm. About a week ago it started to become red and itchy and like kinda swollen? and I've found a boil like bump on the outer left side of my vulva. Its gotten to the point where if I wipe too hard my skin will bleed a bit. My mom thinks I'm a hypochondriac and im overreacting, she just wants me to use over the counter yeast infection stuff but if I don't have a yeast infection and it's something else couldn't that make it worse? Idk I just want this hell to end.