Defined Under Arm Red Blotch

I have been given two creams, Clotrimazole 1% Antifungle and Desonide .05%.  These medications stop the burning, and the redness goes away after two days but then reappears later.  The exterior pattern of the splotch stays the same only the lightness / darkness of the red color changes.  The edges of the splotch is defined clearly from the surrounding white skin.  I do not use deodorant, shave the area, or have any other skin problems.  I have had shingles varicella zoster virus, which as I remember was in My arms but not in the under arm area.   I have had the problem for several years but I would like to know if there is something that I could do to get rid of it.