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He could be having severe infection of the skin called furuncle
. This requires proper antibiotic management after culture and sensitivity of the pus because it could be multi-drug resistant infection. Do not do anything with the lesions, do not prick them. Do not apply alcohol. Apply pressure with a sterilised gauze/cotton to stop the bleeding. Antibiotic ointment will help like Bactroban/Fucidin
. Check his blood sugar. Keep his blood sugar under control. Get him to the ER and get it looked at for proper therapy.