When a blister pops, your priority is to keep the exposed skin clean, protect it with the right covering, and leave the loose skin flap in place. Most popped blisters heal within 3 to 7 days without any complications, but handling the wound poorly can lead to infection. Here’s exactly what to do.
Clean the Area Gently
Start by washing your hands with soap and water before touching the blister. Then wash the blister itself with mild soap and water, pat it dry with a clean towel, and let any remaining fluid drain out naturally. Resist the urge to squeeze the blister to force fluid out, as this can damage the tender new skin underneath.
Leave the Skin Flap Alone
The loose flap of skin over a popped blister acts as a natural bandage. Gently smooth it back down over the raw skin underneath. Don’t peel it off, and don’t pick at the edges. That flap protects the fresh layer forming below and significantly reduces pain from air and friction hitting the exposed area.
The only reason to remove the flap is if it’s badly torn and can’t lay flat, or if you see pus forming underneath it. If the skin is dirty, wash it gently and press it back into place as best you can.
Apply a Thin Layer of Petroleum Jelly
Once the area is clean and the skin flap is smoothed down, apply a thin layer of plain petroleum jelly (like Vaseline). This keeps the wound moist, which helps new skin grow faster and reduces the chance of scarring.
You might assume antibiotic ointment is the better choice, but research tells a different story. Antibiotic ointments containing ingredients like neomycin and bacitracin are known to cause contact dermatitis, leading to redness and irritation that can actually slow healing. Studies comparing plain petroleum jelly to antibiotic-containing ointments found that petroleum jelly produced less redness (12% of wounds) compared to antibiotic alternatives (52%). For a clean wound like a popped blister, plain petroleum jelly is the better option.
Cover It With the Right Bandage
After applying petroleum jelly, cover the blister with a bandage to protect it from dirt and friction. You have two good options.
A standard adhesive bandage works fine for small blisters in low-friction areas. Change it daily or whenever it gets wet or dirty, reapplying petroleum jelly each time.
Hydrocolloid bandages are a better choice for blisters on your feet or anywhere that rubs against clothing or shoes. These bandages contain a gel-forming material that absorbs fluid from the wound while keeping the area moist. They’re self-adhesive, waterproof, and can stay in place for 3 to 7 days without needing to be changed. They also cushion the area, which helps a lot if the blister is on your heel or the ball of your foot. You can find them in most pharmacies, often marketed as “blister bandages.”
What Healing Looks Like
Most blisters heal naturally within 3 to 7 days. During that time, your body grows new skin underneath while slowly reabsorbing any remaining fluid. The old skin on top gradually dries out and peels away on its own. Don’t rush this process by pulling off the drying skin.
For the first day or two, the area will feel tender and may ooze a small amount of clear fluid. This is normal. By day three or four, the tenderness should be noticeably better. If it’s getting worse instead of better, that’s a sign something else is going on.
How to Spot an Infection
A popped blister that gets infected looks and feels distinctly different from one that’s healing normally. Watch for these signs:
- Pus: yellowish or greenish discharge, rather than the clear fluid that’s normal in the first day or two
- Increasing redness: skin around the blister becoming more red over time instead of less
- Red streaks: lines radiating outward from the blister, which can signal the infection is spreading
- Heat and swelling: the area feeling hot to the touch and puffier than expected
- Worsening pain: increasing tenderness after the first couple of days rather than gradual improvement
Red streaks spreading away from the blister are the most urgent sign on this list. That pattern means the infection is moving into surrounding tissue, and you should get medical attention promptly rather than waiting to see if it improves.
Blisters and Diabetes
If you have diabetes, a popped blister on your foot requires extra caution. Diabetes can reduce sensation in your feet, meaning you might not feel pain that would normally alert you to a worsening problem. It also impairs blood flow and immune function in the extremities, so infections are harder to fight off and slower to heal. The CDC warns that a foot blister in someone with diabetes can progress to an ulcer, and in severe cases, an untreated infection can lead to amputation.
If you have diabetes and notice a blister, sore, or any break in the skin on your feet, don’t wait for your next scheduled appointment. See your doctor or podiatrist right away, even if it looks minor.