Most foot blisters heal on their own within a few days if you protect them from further friction. The key decision is whether to leave the blister intact or drain it, and then how to keep the area clean while new skin forms underneath. Here’s what to do at each stage.
Leave It Intact or Drain It
If a blister isn’t causing much pain, leave it alone. The fluid inside acts as a natural cushion while fresh skin grows beneath it. Cover it with a bandage to prevent it from tearing open on its own, and avoid the activity or footwear that caused it.
If the blister is painful or in a spot where it’s going to break on its own (the ball of the foot, the heel), draining it yourself is a better option than letting it tear unevenly. The goal is to release the fluid while keeping the overlying skin intact, because that skin roof protects the raw layer underneath.
How to Drain a Blister Safely
Clean the blister and surrounding skin with iodine or rubbing alcohol. Take a sharp needle and sterilize it by wiping it with rubbing alcohol. Puncture the blister in several spots near its edge, not the center, and gently press to let the fluid drain out. Do not peel off the skin on top.
Once drained, apply a thin layer of petroleum jelly over the blister. A study comparing petroleum jelly to over-the-counter antibiotic ointments found no significant difference in infection rates, so plain petroleum jelly works just as well. If you prefer antibiotic ointment and aren’t allergic to it, that’s also fine. Cover the area with a nonstick gauze bandage.
Check the blister daily. After several days, when the skin roof has dried out and new skin has formed beneath it, you can trim away the dead skin with scissors and tweezers sterilized with rubbing alcohol. Reapply ointment and a fresh bandage.
Choosing the Right Bandage
A standard nonstick gauze bandage works well for most blisters. If the blister is in a high-friction area like your heel, hydrocolloid bandages (the thick, gel-like patches sold at most pharmacies) offer some advantages. They absorb fluid, reduce pain, and form a waterproof seal that keeps bacteria out. They also stay in place for three to seven days without needing to be changed, which means less disruption to the healing skin underneath.
Whichever bandage you choose, make sure it stays put. A bandage that slides around creates more friction and slows healing.
How Long Healing Takes
Friction blisters typically drain on their own and heal within a few days. New skin forms beneath the blister, and the old skin eventually peels away. If you keep wearing the same shoes or doing the same activity that caused the blister, healing can stretch to two weeks or longer. The single most effective thing you can do to speed recovery is eliminate the friction source while the blister heals.
Signs of Infection
A healthy blister contains clear fluid. An infected one fills with milky white, yellowish, or greenish pus. Other warning signs include increasing redness or red streaks spreading outward from the blister, the area feeling hot to the touch, and worsening pain rather than gradual improvement. If you notice any of these, see a healthcare provider. Infected blisters can worsen quickly without proper treatment.
Extra Caution for People With Diabetes
Foot blisters carry more serious risks if you have diabetes. Nerve damage can reduce sensation in your feet, meaning you might not notice a blister until it has already broken open or become infected. Poor blood flow, another common diabetes complication, slows healing and raises the risk that a simple blister progresses to a foot ulcer. Ulcers that don’t respond to treatment can eventually require amputation.
If you have diabetes, don’t try to manage a foot blister on your own. See your primary care provider or podiatrist promptly. In the meantime, keep the area clean, bandaged, and off-loaded (avoid putting weight on it). The CDC recommends checking your feet every day for cuts, blisters, redness, and swelling, using a mirror to see the soles if needed. Always wear shoes and socks, even indoors, to prevent new injuries.
Preventing Blisters in the First Place
Friction and moisture are the two ingredients that produce blisters. Reducing either one makes a significant difference.
Socks matter more than you think. Cotton absorbs sweat and holds it against your skin, keeping your feet damp and blister-prone. Merino wool, nylon, and polyester wick moisture away from the skin so your feet stay drier. Fit matters too. Socks that are too loose bunch up and create friction points. Socks that are too tight restrict circulation, which can make feet warmer and sweatier. Look for a snug, smooth fit with no excess fabric.
Shoes should fit properly. New shoes are a common blister trigger. Break them in gradually rather than wearing them for a full day right away. If a shoe rubs in a specific spot, apply moleskin or a blister-prevention patch to that area before the friction creates a problem.
Lubrication helps in high-friction zones. Applying petroleum jelly or a dedicated anti-chafe balm to blister-prone areas (heels, toes, the ball of the foot) before long walks or runs reduces the friction that causes skin layers to separate. Reapply on longer outings.
Keep feet dry. Change socks if they get wet or soaked with sweat. On long hikes, packing a spare pair of dry socks is one of the simplest and most effective blister prevention strategies available.