I have had a rash on my chin for at least three weeks. Started with a small bump that itches like an insect bite but when I scratched it spread. Some of rash is red and skin underneath is hard but much of the area is covered with flat blisters and skin is spongy. It burns and itches and is very painful. I have spent one whole weekend in bed because of the pain which made me cry. I have tried cortisone creams and ointments topical and oral antibiotics and oral prednisone. I have tried topical pain relievers on it but nothing alleviates the burning and pain but holding ice against it. I am miserable. I have doctors appt this week but I am going nuts.