Hi Genie,   It is difficult to evaluate skin rashes without direct visual contact. A verbal or written description gives you an idea but often is not enough to make a diagnosis. The term "itchy bumps" is not a diagnosis. The biopsy must have had another final diagnosis or it may have been inconclusive.   Possibilities not only include drug side-effects, but folliculitis (infection of the hair follicles), comedones (blackheads) and other forms of acne, and other skin diseases. Skin infections are more common in diabetes.     Have you seen a dermatologist (skin specialist)? Did a dermatologist do the biopsy? If not, I recommend you see one.   To Your Health,   J. Thompson, MD