An open blister on your foot needs three things: gentle cleaning, a moist protective covering, and reduced friction while it heals. Most open blisters heal within one to two weeks with proper home care, but the exposed skin underneath is vulnerable to infection, so how you treat it in the first few hours matters.
Clean the Blister Without Damaging New Skin
Start by washing your hands with soap and water. Then run lukewarm tap water over the open blister for five to ten minutes. You don’t need to spray it or use pressure. Just let the water flow gently over the wound to wash out dirt and bacteria. If your tap water is safe to drink, it’s safe to use on the wound.
Skip the hydrogen peroxide. While those familiar bubbles do kill germs, they also destroy the healthy tissue your body needs to close the wound. Researchers at the University of Utah Health note that hydrogen peroxide can actually create a larger wound than you started with by killing good cells along with the bad. Plain tap water is the recommended cleaning solution. If you want extra disinfection, you can follow up with a mild antiseptic around the edges, but water does the heavy lifting.
Cover It to Keep It Moist
The old advice to “let it air out” is wrong. Wounds heal faster when they stay moist, because the new skin cells need a damp surface to migrate across and close the gap. Drying out a blister slows healing and increases scarring.
After cleaning, apply a thin layer of petroleum jelly over the raw area and cover it with a nonstick bandage or gauze pad. Petroleum jelly works just as well as antibiotic ointment for this purpose. Research published in the Journal of Drugs in Dermatology found no significant difference in infection rates between wounds treated with antibiotic ointment and those treated with plain petroleum jelly. Antibiotic ointments can actually cause contact dermatitis (an itchy allergic rash) in some people, making petroleum jelly the better default choice.
Hydrocolloid bandages are another excellent option. These are the thick, cushioned adhesive patches you’ll find in most drugstores, often marketed specifically for blisters. They create a waterproof seal that absorbs fluid from the wound while maintaining a moist healing environment. One major advantage: they can stay in place for up to a week without changing, as long as they don’t start to smell, get visibly dirty, or become saturated with fluid. They also reduce scarring compared to standard bandages.
Reduce Friction While It Heals
An open blister on your foot faces a unique problem. Every step you take grinds the raw skin against your sock or shoe. The goal is to create a buffer zone around the wound so nothing touches it directly.
Moleskin is one of the most effective tools for this purpose, but you need to use it correctly. Never place moleskin directly over an open blister. The adhesive is strong enough to tear off the remaining skin when you remove it, which makes everything worse. Instead, use the donut method:
- Clean and dry the skin around (not on) the blister.
- Cut a piece of moleskin about three-quarters of an inch larger than the blister on all sides.
- Fold it in half and cut a half-circle roughly half the size of your blister from the folded edge.
- Unfold it so you have a hole in the center that lines up with the blister.
- Stick the moleskin down around the blister, keeping the wound itself exposed through the hole.
This creates a raised ring of padding that takes the pressure off the blister. You can then place a nonstick bandage or hydrocolloid patch over the top. For large blisters, look for moleskin with thick foam backing, which adds more cushioning. While the blister heals, wear shoes with a roomy toe box and avoid the activity that caused the blister in the first place if possible.
Daily Wound Checks
Check your blister every day when you change the bandage (or every few days if using a hydrocolloid dressing). You’re looking for signs that the wound is progressing normally: the raw area should gradually become less tender, fluid drainage should decrease, and new pink skin should slowly fill in from the edges.
After several days, once the blister has started to heal, you can trim away the dead skin flap if one is still hanging on. Use small scissors and tweezers that you’ve wiped down with rubbing alcohol or an antiseptic wipe. Apply fresh petroleum jelly and a clean bandage afterward.
Signs of Infection
Most open blisters heal without complications, but infection is the main risk to watch for. An infected blister feels hot to the touch and fills with green or yellow pus rather than clear fluid. The surrounding skin turns red and may develop spreading streaks, though redness can be harder to spot on darker skin tones. Look for increasing warmth and swelling instead. If the pain gets worse rather than better over two to three days, or you develop a fever, the wound likely needs medical attention.
Special Caution for People With Diabetes
If you have diabetes, the rules change significantly. Diabetes damages nerves and blood vessels in the feet, which means you may not feel how serious a blister has become. Reduced blood flow also slows healing, so even a small open blister can progress into a diabetic foot ulcer. Untreated foot ulcers are the most common reason for toe, foot, and leg amputations in people with diabetes.
Any open wound on a diabetic foot, including a blister, warrants a call to your healthcare provider rather than home treatment alone. Contact them promptly if you notice redness, increased warmth, swelling, tingling, burning, or any sore that isn’t improving.