An open blister heals best when you keep it clean, moist, and protected. Most will close on their own within three to seven days if you care for them properly. The key steps are washing the wound, preserving any remaining skin, applying a moisture barrier like petroleum jelly, and covering it with a nonstick bandage. Here’s how to do each part right.
Clean the Wound First
Start by washing your hands thoroughly with soap and water. Then gently wash the blister and the surrounding skin the same way. You don’t need anything fancy here. Plain soap and water remove bacteria effectively without irritating the raw skin underneath. Pat the area dry with a clean towel or let it air dry briefly before moving to the next step.
Avoid using hydrogen peroxide or rubbing alcohol directly on the open wound. These can damage the new skin cells trying to form and actually slow healing. If you have an antiseptic solution, you can apply it around the blister’s edges, but the exposed wound bed itself does best with gentle cleaning only.
Leave the Skin Flap in Place
If the blister’s roof (that thin layer of skin) is still partially attached, don’t peel it off. That loose skin serves as a natural biological dressing. It protects the raw tissue underneath from friction, bacteria, and air exposure while new skin grows. Gently ease the flap back over the wound using a clean fingertip or a damp cotton swab, then smooth it down as flat as you can.
If the skin flap is torn, blackened, or clearly dead, it’s better to trim it away after a few days. Use scissors and tweezers sterilized with rubbing alcohol or an antiseptic wipe. Leaving non-viable skin in place can trap bacteria and increase infection risk. But when in doubt, leave it alone for the first day or two and reassess.
Apply Petroleum Jelly, Not Antibiotic Ointment
You might assume antibiotic ointment is the better choice for an open wound, but research shows otherwise. Antibiotic ointments offer no healing advantage over plain petroleum jelly for clean wounds. The infection rate for properly cleaned minor wounds is extremely low (under 1%), and topical antibiotics aren’t necessary to prevent it. Dermatologists increasingly recommend petroleum jelly alone for wound care.
Petroleum jelly does two important things: it prevents the wound from drying out and cracking, and it stops the bandage from sticking to the raw skin. Apply a thin layer over the entire exposed area before covering it. Reapply every time you change the bandage.
One thing to avoid: topical pain-relief products containing numbing agents like lidocaine. These are specifically not recommended for open wounds or broken skin, as absorption through raw tissue increases the risk of side effects.
Choose the Right Bandage
Cover the blister with a nonstick gauze pad or adhesive bandage. The “nonstick” part matters. Regular gauze can bond to the wound as it dries, tearing new skin cells away when you remove it. Nonstick pads have a coated surface that sits over the wound without adhering.
Hydrocolloid bandages are another strong option, especially for blisters on your feet or hands where friction is constant. These bandages contain a gel-forming material that absorbs fluid from the wound and creates a moist healing environment underneath. They stay in place well, reduce pain, and can be left on for several days at a time. You’ll find them marketed as “blister bandages” at most pharmacies.
Whichever type you use, secure the bandage so it doesn’t shift. For foot blisters, consider taping the edges down or using a slightly larger bandage that extends well past the wound. Every time the bandage slides and exposes the wound to your sock or shoe, you’re restarting the irritation cycle.
Daily Care Until It Heals
Change the bandage at least once a day, or whenever it gets wet or dirty. Each time, wash the area gently, check for signs of infection, reapply petroleum jelly, and put on a fresh bandage. After several days, once new pink skin has formed underneath, you can trim away any remaining dead skin from the original blister roof using sterilized scissors.
Most open blisters heal within three to seven days. During that window, try to reduce pressure on the area. For foot blisters, that might mean switching shoes, using moleskin padding around (not over) the wound, or simply wearing sandals for a few days. For hand blisters, wearing a thin glove over the bandage can prevent snagging.
As healing progresses, the wound bed will go from raw and shiny to pink and slightly rough. That roughness is new skin forming. Resist the urge to pick at it. Once the new skin looks and feels similar to the surrounding area, you can stop bandaging, though the spot may remain tender or discolored for a couple of weeks.
Burn Blisters Need Extra Caution
If your open blister came from a burn rather than friction, the basic wound care steps are the same: clean, protect, keep moist. But burn blisters carry a higher infection risk because the underlying tissue damage is often deeper. Keep a burn blister covered at all times and watch more carefully for infection signs. Burns that are larger than about three inches across, located on the face, hands, feet, or joints, or that look deep and white rather than pink should be evaluated by a medical professional rather than treated at home.
How to Spot an Infection
Check the blister every time you change the bandage. Signs of infection include:
- Pus: green or yellow discharge from the wound
- Heat: the skin around the blister feels noticeably warm to the touch
- Spreading redness: a growing red zone around the wound, though this can be harder to see on darker skin tones
- Increased pain: pain that gets worse after the first day or two rather than gradually improving
- Red streaks: lines radiating outward from the wound, which suggest the infection is spreading along lymph channels
Some redness right at the wound edge is normal in the first day. What you’re watching for is redness that expands, warmth that increases, or any colored discharge. If you see these, the wound needs medical attention.
Diabetes and Other High-Risk Conditions
People with diabetes face a unique risk with blisters, especially on the feet. Diabetes can damage nerves and blood vessels in the feet, reducing sensation and slowing healing. A small blister you don’t feel can worsen quickly into a serious wound. If you have diabetes and notice any foot blister, redness, increased warmth, swelling, sores, cracks, or a tingling or burning sensation, contact your healthcare provider rather than managing it on your own. The same applies if you have peripheral neuropathy, poor circulation, or a weakened immune system from any cause. For these conditions, what seems like a minor blister can escalate in ways it wouldn’t for someone with normal wound healing.