For most blisters, the best thing to put on them is plain petroleum jelly and a nonstick bandage. If the blister is still intact, you may not need any ointment at all, just a protective covering. The fluid-filled skin acts as a natural barrier against bacteria, so keeping it sealed and cushioned is the priority.
Most blisters heal on their own within three to seven days. As new skin grows underneath, your body reabsorbs the fluid, and the top layer dries and peels off. What you put on a blister depends on whether it’s intact or broken, and whether it came from friction or a burn.
If the Blister Is Still Intact
Leave it alone if you can. Unbroken skin over a blister is the best infection barrier you have. Cover it with a bandage or moleskin to prevent further rubbing, and avoid the temptation to pop it.
If the blister is in a spot where friction is unavoidable (the ball of your foot, for example), cut a piece of moleskin with a hole in the center so the padding surrounds the blister without pressing directly on it. This reduces pressure on the raised skin while keeping the blister roof intact.
If the Blister Has Popped or Needs Draining
Harvard Health recommends leaving blisters intact whenever possible and not attempting to drain them. But if a blister is large, painful, or making it hard to walk, the Mayo Clinic outlines a safe way to drain it yourself:
- Wash your hands and the blister with soap and water.
- Swab the blister with rubbing alcohol or an antiseptic wipe.
- Use a sterilized needle to prick the blister in several spots near the edge.
- Let the fluid drain, but leave the overlying skin in place.
- Apply petroleum jelly and cover with a nonstick bandage or gauze pad.
That top layer of dead skin, even deflated, still protects the raw skin underneath. Don’t peel it off. If a blister breaks on its own, gently wash the area, pat it dry, and try to keep the roof of the blister intact before covering it.
Petroleum Jelly vs. Antibiotic Ointment
You might assume antibiotic ointment is the better choice for an open blister. Research published in the Journal of Drugs in Dermatology found otherwise: antibiotic ointments offer no advantage over plain petroleum jelly for wound healing. The infection rate for clean wounds is extremely low (under 1%), and topical antibiotics aren’t necessary to prevent it.
Antibiotic ointments can actually cause problems. Ingredients like neomycin and bacitracin are known to trigger contact dermatitis, causing redness and irritation that can look like infection and slow healing. In one study, wounds treated with plain white petroleum jelly had noticeably less redness (12%) compared to wounds treated with a popular healing ointment brand (52%). Plain petroleum jelly is the simpler, safer option for keeping an open blister moist while it heals.
Hydrocolloid Bandages
Hydrocolloid bandages (sometimes marketed as “blister bandages”) are a step up from standard adhesive bandages. They contain gel-forming ingredients that absorb fluid from the wound and create a moist healing environment. This matters because wounds that stay moist heal faster than wounds left to dry out.
These dressings also maintain a slightly acidic environment around the wound, which naturally reduces bacterial growth. They form a sealed barrier against outside contamination, encourage new tissue formation, and help the body break down damaged tissue more efficiently. One study found hydrocolloid dressings were linked to lower complication rates and shorter treatment times compared to traditional dressings. They’re a particularly good option for blisters on your feet or hands where a regular bandage tends to slide off.
Burn Blisters Need Different Care
Burn blisters follow different rules than friction blisters. The Mayo Clinic is clear: don’t pop burn blisters. They serve as a critical infection barrier over damaged tissue that’s more vulnerable than a friction wound. If a burn blister breaks on its own, clean it gently with water and apply antibiotic ointment, then cover the area loosely with a clean, dry cloth or sterile gauze.
Seek emergency care for any burn that goes through all layers of skin, looks charred or leathery, has white, brown, or black patches, or covers an area larger than about three inches across. Burns affecting the eyes, mouth, hands, or genitals also warrant professional attention, even if they seem minor. The same goes for burns on babies and older adults.
Signs of an Infected Blister
A normal blister contains clear or slightly yellowish fluid. An infected blister looks different: the fluid turns green or yellow and resembles pus, the blister feels hot to the touch, and the surrounding skin turns red (though redness can be harder to spot on darker skin tones). If you notice spreading redness, increasing pain, or warmth that worsens rather than improves over a few days, the blister likely needs professional treatment.
Preventing Blisters in the First Place
Friction blisters form when repeated rubbing separates skin layers and fluid fills the gap. The goal of prevention is reducing that friction before a blister develops. The early warning sign is a “hot spot,” a patch of skin that feels warm and irritated. That’s the time to act.
Moleskin is the classic prevention tool. Apply it directly over a hot spot to create a buffer between your skin and whatever is rubbing against it. For hiking and outdoor activities, zinc oxide tape is a strong alternative. It’s non-elastic, sticks well even in damp conditions, and stays in place for extended periods. Leukotape is a similar product often recommended for long expeditions in wet environments. Standard cloth athletic tape, by contrast, tends to lose adhesion when you sweat and isn’t a reliable choice.
Moisture-wicking socks, properly fitted shoes, and applying petroleum jelly or anti-chafe balm to friction-prone areas before activity all reduce your risk. If you know a particular pair of shoes gives you blisters, taping the problem spots before you head out is far easier than treating blisters afterward.