How to Prevent Blisters When Running (UK 2026)

Blisters are one of the most common running complaints, and one of the most avoidable. Almost every runner meets them at some point, from a first parkrun to a marathon, so if your feet are sore you are in good company. The good news is that they are usually manageable, and a few small habits stop most of them before they start. Here is what causes blisters, how to prevent them, and how to look after one safely if it does appear.

What actually causes a running blister?

A blister is your skin protecting itself. When the surface layers are rubbed back and forth against a deeper layer, they separate, and the gap fills with fluid to cushion the raw skin underneath. Three things drive that damage: friction, moisture and heat. Friction is the repeated rubbing of skin against sock or shoe. Moisture, from sweat or rain, softens the outer skin so it tears more easily, which is why damp feet blister far faster than dry ones. Heat builds up over the miles and speeds the whole process along. Prevention is really about reducing all three, and almost every tip below does exactly that.

How should your running shoes fit?

Fit is the foundation. Shoes that are too small crush the toes and rub the ends, while shoes that are too big let the foot slide, and sliding is friction. Aim for roughly a thumb's width of space between your longest toe and the front of the shoe, and check that the toe box is wide enough that your toes are not pressed together. Feet also swell over a long run, so it is worth allowing a little extra room and trying shoes on later in the day when your feet are at their largest.

Break new shoes in gradually with a few short runs before you trust them on a long one, because fresh materials and stiff seams need time to soften and mould to your foot. A brand new pair on race day is a classic way to earn a blister.

Which socks stop blisters?

Socks matter more than most runners think. Cotton is the main culprit, because it soaks up sweat, holds it against the skin and loses its shape, bunching into folds that rub. Switch to socks made from moisture-wicking materials such as polyester blends or merino wool, which pull sweat away and keep their fit. Double-layer running socks are worth a try if you blister often, because the two layers slide against each other instead of against your skin.

Whatever you choose, make sure socks sit smooth with no wrinkles, and that seams do not press on sensitive spots. Carrying a spare pair on very long or wet runs lets you change into something dry if your feet get soaked.

Do balm, tape and lacing tweaks really work?

Yes, and they are cheap insurance. Anti-blister balm or a simple lubricant reduces friction on the spots that always seem to rub, such as heels, toes and the ball of the foot. If you get a blister in the same place every time, taping that spot before you run can help. Zinc oxide tape, kinesiology tape or a smooth surgical tape over the hotspot gives the sock something to rub against instead of your skin. The evidence on taping is mixed, but many runners find it useful for known problem areas, so it is worth testing on a training run rather than on race day.

Lacing can help too. If your heel slips, a heel-lock using the top eyelets holds the foot back and cuts movement. Keep your toenails trimmed straight across and not too long, since a long nail can rub the toe next to it or catch on the shoe. Keeping feet dry ties it all together, so wicking socks, a spare pair when needed, and drying your feet well before you lace up all reduce the moisture that makes blisters worse.

What should you do when you feel a hotspot mid-run?

A hotspot is the warning before a blister, a patch that feels warm, tender or like it is starting to rub. Do not run through it and hope. Stop as soon as it is safe and deal with it while it is still just a hot spot. Smooth out any wrinkled sock, shake out any grit, and if you are carrying tape or a blister plaster, cover the area so it is protected for the rest of the run. Adjusting your lacing can be enough. Two minutes at the roadside is far better than limping home on raw skin, so it pays to carry a couple of plasters or a short strip of tape on longer outings.

How do you treat a blister safely?

If a blister has already formed, the safest option is often to leave it alone. Small, intact blisters usually heal on their own within a few days, and the fluid inside acts as a natural cushion and a barrier against infection. Keep it clean, cover it with a soft plaster or blister dressing to protect it, and let it settle.

A large, painful blister that is making it hard to walk is the main exception. General first-aid guidance is that if you do drain one, do it hygienically: wash your hands and the area with soap and water, sterilise a clean needle with rubbing alcohol, pierce the edge of the blister in one or two places, and gently press the fluid out while leaving the overlying skin in place, since that flap protects the raw layer underneath. Cover it with a clean dressing afterwards. Never peel off the loose skin, and avoid draining a blister that is very deep, blood-filled or already sore. If you are unsure, leaving it intact and padded is the lower-risk choice.

When should you see a professional?

Most blisters clear up by themselves, but some need a proper look. See a GP, pharmacist or podiatrist if a blister is very large or extremely painful, if it keeps coming back in the same place, or if you notice signs of infection: spreading redness, increasing pain, warmth, swelling, or yellow or green pus. Red streaks running from the blister, or a fever, can mean an infection is spreading and need prompt medical attention. Take extra care if you have diabetes, poor circulation or reduced feeling in your feet, as foot problems can be more serious and are worth checking early. When in doubt, it is always fine to ask a pharmacist.

Can a plan help your feet toughen up?

None of this needs to be complicated. A little planning around fit, socks and friction prevents the vast majority of blisters, and building your mileage sensibly means your feet adapt over time rather than getting hammered in one go. If you would rather not guess how much running to do and when, a structured plan takes care of the progression for you. Edge builds a fully personalised plan across running, strength, HIIT and mobility, ready in 15 minutes, with a real coach to message anytime, so you can focus on the miles while someone keeps an eye on the bigger picture. It is used by 18,000+ members and treats running, strength and HIIT as one plan rather than as separate apps.

This article is general guidance, not medical advice. If you are new to exercise, returning from injury, pregnant, or managing a health condition, speak to your GP before starting, and see a physio for any niggle that does not settle.