The best thing to put on a blister depends on whether it’s intact or broken, but in most cases, a simple layer of petroleum jelly and a bandage is all you need. Most friction blisters heal on their own within 3 to 7 days as new skin grows underneath and your body reabsorbs the fluid. Your main job is to protect the blister from further friction, keep it clean, and watch for infection.
Leave It Intact When You Can
An unbroken blister is already doing its own wound care. The layer of skin over the fluid acts as a natural barrier against bacteria, and keeping it intact significantly lowers your risk of infection. If the blister isn’t causing much pain, the best approach is to simply cover it and let it heal.
Wash the area gently with soap and water, pat it dry, and apply a thin layer of petroleum jelly. Then cover it with a bandage or, for foot blisters, a piece of moleskin with a hole cut in the center. The moleskin technique creates a “donut” of padding around the blister so nothing presses directly on it. Cut a piece 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 the blister from the folded edge. When you unfold it, you get a hole that fits right over the blister. Stick it down, then cover the whole thing with gauze. If the blister still pokes above the moleskin, add a second layer.
Petroleum Jelly vs. Antibiotic Ointment
You might assume antibiotic ointment is the better choice, but research tells a different story. In studies comparing plain petroleum jelly to antibiotic ointments on clean wounds, there was no significant difference in infection rates. Petroleum jelly keeps the area moist (which helps new skin form faster), creates a protective seal, and doesn’t carry the risk of an allergic reaction that antibiotic ointments sometimes cause. Dermatology guidelines now generally favor nonantibiotic ointments for routine wound care.
That said, if you only have antibiotic ointment on hand, it’s fine to use. The key is keeping the blister moist and covered rather than leaving it exposed to air.
How to Drain a Painful Blister Safely
When a blister is large or painful enough that it interferes with walking or using your hands, draining it can bring relief. The goal is to release the fluid while keeping the overlying skin in place, since that flap of skin still protects the raw tissue underneath.
Start by washing your hands and the blister thoroughly with soap and water. Apply an antiseptic to the surface. Sterilize a needle with rubbing alcohol, then make a small puncture near the edge of the blister. Gently press the fluid out and apply petroleum jelly or an antiseptic ointment. Cover it with a bandage.
After several days, once the skin underneath has had time to regenerate, you can trim away the dead skin flap using scissors and tweezers sterilized with rubbing alcohol. Reapply ointment and a fresh bandage.
Hydrocolloid Bandages
Hydrocolloid bandages (sometimes sold as “blister bandages”) are a step up from standard adhesive bandages. They contain a material that absorbs fluid from the blister and turns it into a soft gel, creating a moist healing environment right against the skin. This gel layer also prevents the bandage from sticking to the wound, so you won’t rip off new skin when you change it.
These bandages seal the blister from dirt and bacteria, reduce pain by cushioning the area, and maintain the temperature and moisture level that speeds up tissue repair. They’re especially useful for foot blisters where you need to keep walking, since they stay in place better than regular bandages and add a layer of padding against your shoe.
Blood Blisters Need a Different Approach
Blood blisters, which form when small blood vessels under the skin break from pinching or crushing rather than friction, should never be popped. Draining a blood blister increases the risk of infection in the deeper tissue layers. Apply an antibacterial cream or ointment, cover it with a bandage, and let it resolve on its own. The blood will gradually be reabsorbed.
What an Infected Blister Looks Like
Most blisters heal without complications, but infection is the main risk to watch for. Normal blister fluid is clear or slightly yellowish. Signs that a blister has become infected include the fluid turning green or yellow (pus), the skin around the blister becoming red and hot, increasing pain rather than gradual improvement, or swelling that spreads beyond the blister itself. On darker skin tones, redness may be harder to spot, so pay attention to warmth and swelling instead.
When Home Care Isn’t Enough
People with diabetes need to be especially cautious with foot blisters. Diabetes can damage the nerves and blood vessels in the feet, which means you might not feel a blister forming, and once it does, it may heal slowly. Even a small blister can become a serious problem if infection develops. If you have diabetes and notice any redness, swelling, warmth, sores, or tingling in your feet, contact your healthcare provider rather than managing it at home.
The same applies to blisters that show signs of infection, blisters that keep recurring in the same spot, or any blister that hasn’t improved after a week. Burns, chemical exposure, and allergic reactions can also cause blisters that need professional evaluation rather than simple first aid.