 [ Symptoms ] rash on lower back h i have had a rash on my lower back for a few months now that will not go away it is on the top of my buttocks to be precise it is somewhat itchy whenever i am sweatingworking out but does not cause pain i am worried it may be an std but i have not had any type of sexual intercourse since august 2015 any help is well appreciated thank you [ Disease ] an std is really unlikely here it probably has more to do with chafing heat the clothes you wear or the soaps you use try a little body powder to reduce the chafing or maybe try different clothes if you can get a break to do that in and put a little acne wash on there in the shower to clear up the bumps