Blisters are usually caused by friction and burns. An outer layer separates from the inner layer and the area fills up with fluid.
The blister must not be broken as the skin becomes a natural barrier to reduce the risk of infection. Allow the wound to breathe but keep it covered with bandages or gauze.
Only if the blister is painful and causes pain you can consider self-care measures listed below:
Please note that if you have diabetes or poor circulation, call your doctor before considering the self-care measures.