I seem to have a rash that moves to different parts of my body. Usually under arm, or in groin area, and sometimes a red line near it.?

Moving rash. The armpit and groin are naturally moist, but also normally home to benign yeast, fungi and bacteria. This may be nothing to be worried about, but it can be a sign of diabetes. Diabetics are prone to infections. Other immune suppressors can also do this, so time for a check at a primary care provider more then a simple answer on line. Check it out to be safe.