Most friction blisters heal on their own within one to two weeks if you keep them clean and protected. The single most important thing you can do is leave the roof of the blister intact, because that layer of skin acts as a natural sterile bandage over the raw tissue underneath. Beyond that, a few simple steps can speed healing and prevent infection.
Leave It Alone When You Can
The fluid inside a blister is your body’s built-in cushion. It protects the new skin forming underneath and keeps bacteria out. If the blister is in a spot where it won’t get rubbed or pressed, the best approach is to simply cover it with a loose bandage and let your body reabsorb the fluid over a few days.
Small blisters on the tops of your feet, the back of your heel (once you switch shoes), or anywhere you can easily protect them generally don’t need any intervention beyond a bandage.
When Draining Makes Sense
Sometimes a blister sits right where you can’t avoid friction: the palm of your hand, the sole of your foot, a finger you use constantly. If a blister is large, painful, and likely to burst on its own from normal activity, draining it yourself in a controlled way is safer than letting it tear open randomly.
One important exception: never pop a fever blister (cold sore). These are caused by a virus, and breaking the skin spreads it to other areas or other people. The advice below applies only to friction blisters and blood blisters.
How to Drain a Blister Safely
The Mayo Clinic recommends this approach:
- Wash your hands and the blister thoroughly with soap and water.
- Disinfect the blister surface and a sharp needle with rubbing alcohol or an antiseptic wipe.
- Puncture the blister in several spots near its edge. Don’t poke the center, and don’t remove the overlying skin.
- Press gently to let the fluid drain out while keeping the roof of the blister flat against the skin beneath it.
- Apply ointment and cover with a clean bandage.
That overlying flap of skin is critical. It protects the tender new skin underneath and dramatically lowers your infection risk. Even if the flap is loose and wrinkled after draining, leave it in place.
What to Put on It
After draining a blister or if one has burst on its own, you need to keep the wound moist and covered. Plain petroleum jelly works just as well as antibiotic ointment for this purpose. Research comparing the two found no significant difference in infection rates, and antibiotic ointments actually carry a notable risk of causing contact dermatitis, an itchy allergic skin reaction that can slow healing. A thin layer of petroleum jelly and a bandage is the simpler, safer choice.
Hydrocolloid bandages (the thick, cushioned patches often sold specifically for blisters) are another strong option. They contain a gel-forming material that absorbs fluid from the wound and creates a moist healing environment underneath a sealed, waterproof barrier. The gel also prevents the bandage from sticking to raw skin, so changing it doesn’t rip away new tissue. These bandages are particularly useful for blisters on your feet because they add a layer of padding that reduces further friction.
Signs of Infection to Watch For
Check your blister daily. A healing blister may be slightly pink and tender, but certain changes signal that bacteria have moved in:
- Increasing redness that spreads beyond the edges of the blister
- Warmth and swelling that gets worse instead of better over two to three days
- Cloudy or yellowish discharge replacing the clear fluid
- Red streaks extending away from the blister toward your groin or armpit
Those red streaks are a sign of lymphangitis, meaning the infection is traveling through your lymph system. This can progress quickly and cause fever, chills, rapid heart rate, and headache, sometimes before the streaks are even visible. If you notice streaking, swelling in nearby lymph nodes, or a fever alongside a worsening blister, that needs prompt medical attention.
Burn Blisters Need Different Care
If your blister came from a burn rather than friction, the rules change. Do not drain a burn blister. The Cleveland Clinic advises keeping burn blisters intact and closed. If the blister hasn’t broken, you can leave it uncovered. If it does break on its own, cover the area with a clean bandage to prevent infection, and avoid clothing or materials that rub against the wound.
Burn blisters cover tissue that has been heat-damaged at a deeper level than friction blisters. The skin underneath is more vulnerable, heals more slowly, and is at higher risk of scarring if exposed prematurely.
Extra Caution for People With Diabetes
Diabetes damages the nerves and blood vessels in your feet, which creates a double problem. Reduced sensation means you may not feel a blister forming or worsening. Poor circulation means the tissue heals more slowly and is more susceptible to infection. A small, unnoticed blister can progress to a diabetic foot ulcer, which is far harder to treat.
If you have diabetes, check your feet daily, including between your toes. Wear shoes at all times, and inspect the insides of your shoes before putting them on for anything that could cause friction. When you buy new shoes, break them in gradually: one to two hours a day for the first couple of weeks. Switching shoes partway through the day also helps by changing the pressure points on your feet. If you develop a blister, contact your healthcare provider rather than managing it at home.
Preventing Blisters in the First Place
Blisters form when repeated friction separates the upper layers of skin. Anything that reduces that shearing force will reduce your risk.
Moisture-wicking socks made from synthetic blends or merino wool keep your feet drier than cotton, and dry skin experiences less friction. Avoid socks with prominent seams over pressure points. For trouble spots you already know about, anti-friction balms or sticks create a lubricating barrier on the skin. These products typically contain skin protectants combined with waxy, silicone-based ingredients that let surfaces slide past each other instead of gripping.
Proper shoe fit matters more than shoe quality. A shoe that’s slightly too tight or too loose generates friction with every step. If you’re breaking in new footwear, limit wear time and have a comfortable backup pair available. For hands, wearing gloves during repetitive tasks like raking, rowing, or weightlifting prevents the friction that causes palm and finger blisters.
If you feel a hot spot developing, that burning sensation before a blister forms, stop and address it immediately. Apply a padded bandage or hydrocolloid patch to the area. Catching it at the hot-spot stage often prevents a blister from forming at all.