Blisters can arise from a variety of causes, ranging from heat to friction. The tissue around a blister forms a seal around the exposed skin, keeping out infection on the majority of occasions. At times, however, infectious organisms may be able to access the underlying pus and tissue, rapidly forming an infection. Care must be used when treating an infected blister, as only the proper procedures can reduce the risk of spreading the infection to other parts of the body.
An infected blister often is noticed when the pus changes in color from clear to a white or yellow tone. They are also often more painful, with pain even extending to the area around the blister. Most of the time, the blister will heal of its own accord if it is simply left alone. Individuals with blisters they suspect of infection should therefore try to leave them alone at first, to see if the fluid begins to re-absorb into the body of its own accord. Blisters should not be touched, so as to avoid passing germs to or from the blister with the hand.
Piercing a blister, especially an infected one, is never a viable treatment option. Even if the needle or tool used to pierce the blister is sterile, it will break the outer layer that prevents germs from getting in. In turn, this increases the chances of a worse infection that could start from airborne germs.
To protect the infected blister and keep it from breaking, it is best to cover it. Small pieces of plaster or cloth can be used to wrap smaller blisters. A gauze pad taped to the skin around the blister can be used to safeguard a larger blister. Soft, sterile cloth dressings can be used to cover up blisters on the toes, or others that are in danger of popping. Dressings should be changed on a daily basis to keep them clean.
An ice pack may be used sparingly on painful blood blisters, but should be applied over the cloth or plaster covering, never directly to the blister. In the event of an infected blister, medical attention should usually be sought. Prescription antibiotics will heal the infection, and keep it from potentially spreading through the bloodstream. This decision is even more essential if the individual suffering from the blister already has a preexisting skin condition, or a particular susceptibility to bacterial infection.