Cleaning a blister is straightforward: wash the area gently with mild soap and water, pat it dry, and protect it with a bandage. Most blisters heal on their own within three to seven days without any special treatment. The key is keeping the area clean without disturbing the blister’s natural protective roof, which acts as a sterile barrier over the raw skin underneath.
Intact Blisters: Leave the Roof Alone
If your blister hasn’t popped, your main job is to keep it clean and protected while your body does the rest. The thin layer of skin covering the blister is doing important work. It shields the tender new skin forming underneath from bacteria and friction, and your body will slowly reabsorb the fluid inside as that new skin grows in. Eventually the blister roof dries out and peels off on its own.
Wash the blister and surrounding skin once or twice a day with mild soap and lukewarm water. Avoid scrubbing. Pat the area dry with a clean towel rather than rubbing. Then cover it with a bandage to prevent friction from shoes, clothing, or tools from tearing the skin open. Small, painless blisters that aren’t in a high-friction area can be left uncovered, but anything on your feet, palms, or fingers benefits from a protective layer.
If the Blister Breaks on Its Own
Blisters pop. It happens, especially on feet. When one breaks, gently wash the area with soap and water and pat it dry. Don’t peel off the loose skin. That deflated roof still provides a layer of protection against infection and helps speed healing. Think of it as a natural bandage.
After cleaning, apply a thin layer of petroleum jelly over the exposed area. Petroleum jelly keeps the wound moist, which promotes faster healing and prevents the bandage from sticking to the raw skin underneath. You might assume antibiotic ointment would be the better choice, but research on over 1,200 wounds found no infection-preventing benefit from antibiotic ointment compared to plain petroleum jelly. About 1% of people using antibiotic ointment developed an allergic skin reaction, while none in the petroleum jelly group did. Plain petroleum jelly is cheaper, safer, and equally effective.
Cover the area with a bandage and change it daily, or whenever it gets wet or dirty. Each time you change the bandage, wash the area again and reapply petroleum jelly.
Should You Drain a Blister?
The general recommendation is to leave blisters alone. Small, unbroken blisters heal naturally and draining them introduces a risk of infection that wasn’t there before. The only reason to consider draining is if a blister is large, painful, and in a spot where it’s likely to burst on its own anyway, like the sole of your foot.
If you do drain one, the technique matters. Wash your hands and the blister thoroughly with soap and water first. Sterilize a needle by holding the tip in a flame until it glows red, or by soaking it in rubbing alcohol. Make a small puncture near the edge of the blister and let the fluid drain on its own. Don’t squeeze it. Leave the overlying skin completely intact. Then clean the area, apply petroleum jelly, and bandage it as you would a broken blister.
That said, medical professionals generally advise against draining blisters at home. Improper technique can cause further damage or infection. If a blister is large enough that it’s significantly interfering with your ability to walk or use your hands, having it drained by a doctor or trained professional is the safer route.
Choosing the Right Bandage
A standard adhesive bandage works fine for most blisters, especially small ones in low-friction areas. For blisters on your feet or anywhere that gets regular rubbing, hydrocolloid bandages (the thicker, gel-like patches sold as “blister bandages”) offer several advantages. They contain a gel-forming material that absorbs fluid from the wound while keeping the area moist. This creates conditions that support faster healing, and the gel texture prevents the bandage from sticking to the wound when you peel it off, so you’re not ripping away new skin every time you change it.
Hydrocolloid bandages also form a sealed barrier that keeps out dirt and bacteria, and they’re thick enough to cushion the blister against further friction. They can stay on for several days as long as they remain sealed around the edges. If you’re dealing with a blister on your heel or toe and need to keep walking on it, these are worth the extra cost over regular bandages.
Signs of Infection
Most blisters heal without any complications, but infection is the main risk to watch for, particularly if the blister has opened. The warning signs are distinct: the blister fills with green or yellow pus instead of clear fluid, the area feels hot to the touch, and the surrounding skin turns red. On darker skin tones, the redness can be harder to spot, so pay close attention to warmth and the color of any fluid.
Increasing pain, swelling that spreads beyond the blister, or red streaks radiating outward from the area are all signs that something more serious is developing and needs medical attention.
Blisters and Diabetes
People with diabetes need to treat foot blisters with extra caution. Nerve damage from diabetes can reduce sensation in the feet, which means you might not feel a blister forming or notice when one has broken open and become infected. The CDC recommends that people with diabetes check their feet daily for blisters, cuts, redness, and swelling. A blister that would be minor for most people can become a serious wound when circulation is poor and healing is slower.
If you have diabetes and develop a blister, sore, or any break in the skin on your feet, don’t wait for your next scheduled appointment. Have it evaluated promptly rather than managing it at home.