Q: Skin rashes in an 55 year old diabetic male taking metformin since last 8 years A: Now let me search the medical library and look for relevant images simultaneously. A: Now let me read the relevant textbook sections on granuloma annulare and diabetic skin manifestations: A: I now have enough information to provide a comprehensive answer. Let me read a bit more of the textbook section on granuloma annulare specifically: