I have had a very itchy rash on the top of my buttcrack. i tried vaseline and lotrimin (clotrimazole) with no help. any suggestions?

Find the cause: You should find out what it is. If it's a fungal rash, the vaseline is completely undoing any benefit you might be getting from the lotrimin (clotrimazole). That's also a common place for herpes, which can be itchy, and neither vaseline nor lotrimin (clotrimazole) would treat herpes. Since it's not possible to post pictures on healthtap, i'd suggest you see a doctor during an outbreak of the rash.