Red Itchy Bumps, Some Blistered Ramdom Over Body - Legs,

red itchy bumps, some blistered ramdom over body - legs, butt, shoulder -extreme itching. went to quick doc, said poison ivy, gave me a shot of steroids, with 5 day prednisone pills - just doesn't seem like poison ivy more like something bit me?? drying, but itches like crazy