<s>[INST] I have a severely itchy rash that is on my knee, the side and sole of my foot, my elbow, and my pelvic bone. It has gone from being in one or two places to what seems like everywhere. It has these little bumps that are like blisters and they puss and seem to cause more itching. I am about to scratch all my skin off and need help to see if theres a simple solution or I need medicine. [/INST] HIT hank for asking to ChatDoctorThis could be autoimmune disorder, and might have got infection by itching, still I would advise you to better get your self examined by medical person, for symptomatic relief you can apply any skin soothing agent along with some antibiotic preparation (If it really fills with pus), only corticosteroid does help very nicely if it is autoimmune disease (College) but I won't advise you for steroid because it has to be given after clinical examination and under medical supervision, have good day. </s>