Suggest Medication For Chronic Irritation And Rashes Around My Stomach

since the past one year i've been havin irritation sensation all over ma body initially due to the irritation i developed rashes around ma stomach now the rashes have turned black some sort of pigmentation and spreading over to rest of ma body as well .i've used the following medicine but of no help.1clotrimazole2.betamethasone.3clobetasol.3gentamycin.4antihistamines.

plz help