From doing sports and martial arts ive always had that sweat smell, however on and off for the last year maybe shorter, ive started to see this like white residue on some of my pubic hair on the bottom of my scrotum and inner thighs only. and it smells kinda funny, however i haven't had sex in about 18 months. I also have had these brown rashes or tough area on the inside of my thighs since i was younger, i think maybe scarring from chaffing. Im not sure if its a fungus or an std, and as far as i can remember, i was always protected, on top of that i cant afford the 100$ for an std test at this moment, any idea?