Foot blisters are caused by infection or the use of new shoes. Another cause of blisters is ill-fitting shoes. Foot blister is healed by itself. Cover the blister with a bandage. The bandage should be tied loosely. If the blister is on foot bottom, do not cover it with bandage. Leave this blister open. Big and painful blisters should be drained. Apply rubbing alcohol on a pin and pierce the blister with this, pressing and draining the fluid. Wash using soap as well as water. Avoid removing the blister skin. Apply antibiotic cream and cover with bandage. The following article will tell you how to treat a foot blister.