For an open blister, the best thing to apply is a thin layer of plain petroleum jelly (like Vaseline) covered by a clean bandage. Petroleum jelly keeps the wound moist, which helps new skin grow faster and reduces pain. Avoid antibiotic ointments, hydrogen peroxide, rubbing alcohol, and iodine, all of which can irritate or damage the exposed skin underneath.
How to Clean an Open Blister
Before putting anything on the blister, wash it gently with plain soap and water. That’s it. The American College of Surgeons specifically warns against using disinfectants and antiseptics like hydrogen peroxide, rubbing alcohol, or iodine on open wounds because they’re more likely to damage tissue than help it heal. Soap and water is enough to remove bacteria and debris without harming the fragile new skin forming underneath.
Pat the area dry with a clean cloth or gauze. If the blister still has a flap of skin attached, leave it in place for now. That loose skin acts as a natural bandage, protecting the raw layer beneath. After several days, once the skin underneath has started to heal, you can trim the dead skin away with scissors and tweezers sterilized with rubbing alcohol.
Petroleum Jelly Over Antibiotic Ointment
You might instinctively reach for Neosporin or another antibiotic ointment, but plain petroleum jelly works just as well and carries fewer risks. Studies comparing the two found no significant difference in infection rates between wounds treated with antibiotic ointment and those treated with petroleum jelly alone. Meanwhile, common antibiotic ingredients like neomycin and bacitracin are known to cause contact dermatitis, a red, itchy skin reaction that can make your blister feel worse and slow healing.
Petroleum jelly’s job is simple: it creates a moisture barrier over the wound. Open skin that dries out forms a thick scab, and healing has to happen slowly underneath that crust. When you keep the wound moist, the cells responsible for repair can move freely and function more efficiently. Apply a thin layer each time you change the bandage.
Choosing the Right Bandage
A standard adhesive bandage works fine for small blisters in low-friction areas. But if the blister is on your foot, heel, or anywhere that rubs against clothing or shoes, a hydrocolloid bandage is a better choice. These are the thick, gel-like blister cushions sold by brands like Compeed and Band-Aid Hydro Seal.
Hydrocolloid bandages create a sealed, moist environment over the wound. They absorb excess fluid from the blister while allowing immune cells to reach the area more easily, which reduces inflammation. One study found hydrocolloid bandages heal blisters about 20% faster than ordinary bandages, and people who used them reported immediate, significant pain relief. They also stay in place about 50% longer than regular bandages, which matters when a blister is on your foot and you need to keep walking.
If you use a hydrocolloid bandage, you generally don’t need petroleum jelly underneath since the bandage itself maintains the moist environment. Leave it on for several days until it starts to peel at the edges on its own.
Protecting Blisters in High-Friction Areas
For blisters on your feet or other spots that take constant pressure, moleskin padding can prevent further damage. The key is to never place moleskin directly over the open blister, because its strong adhesive will rip the skin off when you remove it.
Instead, create a donut shape: cut a piece of moleskin about three-quarters of an inch larger than your blister on all sides, fold it in half, and cut a half-circle out of the center. When you unfold it, you’ll have a hole that fits around the blister. Stick the moleskin to the healthy skin surrounding the wound so the blister sits inside the cutout, protected from pressure. If the blister rises above the moleskin layer, stack a second piece to build up the height.
What Healing Looks Like
Most blisters heal within three to seven days. During that time, your body grows new skin underneath the open area while gradually reabsorbing any remaining fluid. The old skin on top dries out and eventually peels away on its own.
Change your bandage at least once a day, or whenever it gets wet or dirty. Each time, wash the area with soap and water, reapply petroleum jelly, and put on a fresh bandage. You should see the raw area gradually shrink and lighten in color as new skin fills in.
Signs of Infection to Watch For
Most open blisters heal without complications, but the exposed skin is vulnerable to bacteria. Watch for these warning signs over the first few days:
- Increasing redness that spreads beyond the blister’s edges rather than improving
- Red streaks extending outward from the blister, which can signal a fast-spreading infection called lymphangitis that needs immediate medical care
- Cloudy or yellow-green drainage rather than clear fluid
- Warmth and swelling that gets worse instead of better
- Fever or flu-like symptoms alongside the wound changes
Red streaks radiating from a wound are particularly urgent. This pattern means the infection is moving through your lymphatic system and can progress quickly. If you see streaks, don’t wait to see if they improve.
Blisters on Diabetic Feet
If you have diabetes or any condition that affects circulation or sensation in your feet, an open blister requires more caution. Reduced blood flow slows healing, and nerve damage (neuropathy) can mask pain signals that would normally alert you to worsening damage or infection. A blister you can barely feel can quietly become a serious wound. Even a small open blister on a diabetic foot is worth having a healthcare provider look at, especially if it’s not showing clear improvement within a couple of days.