I got tested last Friday and got my results today and they all came back negative.

I'm wonder why I get this rash on my penis that comes and goes it will be here for like a few hrs then disappears then appear 2 days later and disappear again any clue what it is I taught I had an std got tested and all the test came back negative so that's one less worry.

You could have an allergy to something Track EVERYTHING. Eat, wear, soaps anything and everything. Then go to a doctor and see what they say. Could just be a bacterial issue that can be easily fixed. Try not to stress.