The best thing to put on a foot blister depends on whether it’s intact or broken. For an unbroken blister, apply petroleum jelly and cover it with a nonstick bandage or a hydrocolloid blister bandage. For a blister that has torn open, clean it gently, apply petroleum jelly, and protect it with a nonstick dressing. Most foot blisters heal on their own within three to seven days as new skin grows underneath and the fluid gradually reabsorbs.
What to Put on an Intact Blister
If the blister’s skin is still in one piece, your goal is to keep it that way. That top layer of skin is the best natural bandage you have, protecting the raw tissue underneath from bacteria and friction. Apply a thin layer of petroleum jelly over the blister, then cover it with a nonstick bandage or gauze pad. The petroleum jelly keeps the area moist, which speeds healing and reduces the chance of the skin cracking or tearing on its own.
Hydrocolloid blister bandages (sold under brands like Compeed or Band-Aid Hydro Seal) are a step up from regular adhesive bandages. They contain a gel-forming inner layer that absorbs fluid, creates a moist healing environment, and cushions the blister from further friction. The outer layer is waterproof, so it shields against bacteria and stays put during activity. These bandages are flexible enough to conform to heels and toes, and they can stay in place for several days without needing to be changed. When you do remove them, they come off without sticking to the wound.
What to Put on a Broken Blister
If the blister has already popped or the skin has torn, gently clean the area with mild soap and water. Don’t peel away the loose skin; it still offers some protection. Pat the area dry, apply petroleum jelly, and cover it with a nonstick bandage or gauze pad secured with medical tape.
You might reach for antibiotic ointment out of habit, but research shows it offers no real advantage over plain petroleum jelly for wound healing. Studies comparing the two found no significant difference in infection rates. Petroleum jelly does the same job of keeping the wound moist and protected without the risk of an allergic reaction that antibiotic ointments sometimes cause. Plain petroleum jelly is the better choice for most people.
How to Pad Around a Blister
Covering a blister is only part of the job. You also need to reduce the friction that caused it. Moleskin, a thick, durable fabric with an adhesive backing, is one of the most common tools for this. Cut a piece of moleskin slightly larger than the blister, then cut a hole in the center so the pad surrounds the blister without pressing directly on it. This donut shape redistributes pressure to the healthy skin around the blister and keeps your shoe from rubbing against the damaged area. Molefoam is a thicker version that works well for deeper cushioning on heels or the balls of the feet.
Gel-filled blister pads are another option. These can be placed inside your shoe at pressure points to add a cushioning layer between your foot and the shoe. They’re especially useful when you need to keep walking or running and can’t rest the blister.
Should You Drain a Large Blister?
Small blisters are best left alone. Large, painful blisters that make it difficult to walk can be drained carefully, but the goal is to keep the overlying skin intact. Wash your hands and the blister with soap and water. Sterilize a needle with rubbing alcohol, then puncture the blister near its edge in a few spots to let the fluid drain. Gently press the fluid out, apply petroleum jelly, and cover with a nonstick bandage. Leave the roof of the blister in place so it continues to protect the new skin forming underneath.
Signs of Infection to Watch For
Most blisters heal without complications, but an infected blister looks and feels distinctly different from a normal one. The fluid inside turns green or yellow instead of clear. The skin around the blister becomes hot to the touch and increasingly red, though redness can be harder to spot on darker skin tones. Increasing pain, swelling, or streaking around the blister are also warning signs that the wound needs medical attention.
Preventing the Next Blister
What you put on your feet before a blister forms matters as much as what you put on after. Socks make a significant difference. Cotton absorbs three times as much moisture as synthetic fibers and takes roughly ten times longer to dry. That trapped moisture dramatically increases friction against your skin. Synthetic fabrics like acrylic, polypropylene, and polyester wick moisture away from the foot’s surface, keeping friction lower during sustained activity.
Taping blister-prone areas before activity is one of the most effective prevention strategies. Paper medical tape applied directly to the skin has been shown to reduce blister occurrence. Moleskin and zinc oxide tape also reduce blister formation and severity. These are simple, inexpensive options you can apply in minutes before a hike or long run.
Foot antiperspirants containing 20% aluminum chloride hexahydrate significantly reduce blister formation by keeping the skin drier. Anti-chafe balms and lubricants can also help, though they need to be reapplied frequently. Lubricants lose their protective benefit within about an hour, and friction actually increases 35% above normal during the four to six hours after the lubricant wears off. If you go this route, reapply regularly or combine lubrication with moisture-wicking socks for better protection.
Properly fitting shoes remain the foundation of blister prevention. A shoe that’s too tight creates constant pressure, while one that’s too loose allows the foot to slide and generate friction. Breaking in new shoes gradually rather than wearing them for a full day of activity gives both the shoe and your skin time to adjust.