Any suggestions ?

Every single month i get a risen bump on the inner butt cheek (more near the vag) , and on one of my vagina lips. always the same spots…… doctor tested one of the risens for herpes being that it comes monthly. it came back negative…… anyone has any suggestions on how could i avoid these? i really need embarrassed to have sex because it looks like i have something when i really don’t. please help.