For running
Running blisters, and the shoe underneath them
Short version: tape a hot spot the second you notice it, because the window between warm and blistered is short. If one is already up, lance it from the side so the roof survives, cover it with hydrocolloid, and tape over the top.
Before any of that — most recurring running blisters are a fit problem.
Feet swell over distance. A shoe that fits at rest can be a size too small at 30km, and then your toes are pressed into the front and the sides on every stride. Runners who blister in the same spot every long run usually fix it by going up a size, or into a wider toe box, before anything else makes a difference.
Where it is tells you what it is.
Between the toes — Toe socks are the fix for these specifically, and only these.
Tips of the toes, or the inside of the big toe — Usually a shoe that is short or narrow. Toes press into the front, and a longer second toe makes it worse.
Ball of the foot — Friction and heat over distance. Lube and sock choice help, and so does a shoe that stays put.
Heel or Achilles — The shoe’s heel collar sawing. Lacing changes shift this more than anything else.
A dark or lifting toenail — A different problem. See a podiatrist.
The window
Catch the hot spot.
A blister starts as a hot spot — skin that is warm and starting to rub. That is your window, and on a long run it lasts minutes.
Stop. Dry the skin. Cover it before it becomes a blister: a strip of hydrocolloid roll tape cut to the shape of the rub, or a pre-cut patch if the spot suits one.
Runners who finish long distances with good feet all treat this the same way. The moment you feel it, deal with it, even if it costs you two minutes.
Lancing one without wrecking the roof.
If it is up and full and you are going to drain it anyway, runners and rowers land on the same method.
- 1
Sterilise a needle. A needle makes a smaller hole than clippers or scissors and leaves more of the protective skin intact.
- 2
Go in from the side. Through healthy skin beside the blister, at a shallow angle, sliding underneath.
- 3
Press the fluid out. Through that same channel. Slow, steady pressure.
- 4
Keep the roof. The loose skin on top is the best cover the raw skin has.
- 5
Cover it. Hydrocolloid cut a centimetre wider than the raw area, so it seals onto clean skin.
- 6
Tape over it. Inside a shoe that is about to get sweaty, the dressing needs holding on. Leukotape P is what runners reach for. Run the strips horizontally so the ends grab the sides of your foot, or wrap once so the tape sticks to itself.
Clean hands, clean needle. One runner ended up on a week of antibiotics after opening one with their fingernails in bed — spreading redness, heat, swelling or pus means a doctor.
Race week
Racing on Sunday.
Nothing new on race day. New shoes, new socks or new tape the week of a marathon is how you discover something rubs at 25km.
If a spot is already sore going in, what works is a shoe you have run in, a lacing change to take the pressure off, and a dressing you have already tested on a long run. Where the trouble is pressure on a raised blister, cut a donut of moleskin so the blister sits in the hole and put a layer over the top. It is the old military trick and it still works.
On anything long, the runners with good feet at the finish do the same handful of things: change socks partway, clean their feet while they are off, get dust and stones out of the shoe, and tape a hot spot the moment it announces itself.
Preferences
Where runners disagree.
Pop it or leave it. Medical advice says leave it, because intact skin is a sealed barrier. Plenty of runners lance them anyway to keep training. One runner cut through the whole argument: the real question is whether you sterilise. If you drain it, do it properly and treat what is left as a wound.
Toe socks or liner socks. Injinji-style toe socks solve blisters between toes and do little elsewhere. The older system is a thin liner sock under a wool one, so the two layers slide against each other and leave your skin out of it. Plenty of runners have stopped blistering either way.
Lube or tape. Some runners coat their feet and never tape. Some tape the spots they know about and skip the lube. Over long distances, many do both.
Prevention
The things that actually stop it.
Shoes, socks and lube, and we make none of them.
Shoes. Go up a size if your toes hit the front on long runs, and get fitted somewhere that watches you run. A race shoe wants room for the version of your foot at 35km.
Socks. Merino or synthetic. Never cotton. A liner under a wool sock, or toe socks if the problem is between your toes.
Lube. Anti-chafe balm on the spots you already know about, before you start.
Lacing.A heel or Achilles rub is often a lacing problem. A runner’s loop through the top eyelets holds the heel down and stops the collar sawing.
What to use
Cut to the rub, or grab a shape.
Roll tape
A rub along the side of a heel or under a toe is a shape no pre-cut patch matches. Cut to the rub and leave a centimetre of clean skin all round.
Roll Tape →Blister patches
Faster when the spot is round and obvious. Five shapes covering heels, toes and the ball of the foot.
Blister Patches →For anything long you want Leukotape P or a thin sports tape over the top. Any chemist or running shop has it, and we do not sell it.
Same injury, other places
Boots, pointe shoes and oars.
For boots and multi-day trips, the trail blister guide covers hot spots on the trail and making a patch last several days. Toes in a pointe shoe are in the ballet guide, and hands on a handle are in the rowing guide.
For how to cut the roll so it stays put, see the hydrocolloid tape guide.
Common questions
The things runners ask.
Should I pop a running blister?
Leaving it intact is the safer answer. If you are going to drain it, sterilise a needle, go in from the side, leave the roof of skin on, cover it, and watch for infection.
Why do I only blister at races?
Faster pace, more heat, more sweat, and usually something new on your feet. Race-only blisters tend to mean race-only kit.
Will toe socks fix my blisters?
Only the ones between your toes. For anywhere else, start with shoe size.
I have a blister on my heel and a marathon on Sunday.
Lance it from the side if it is up, cover it with hydrocolloid, tape over the top, and test the setup on a run first. Change your lacing to take pressure off the heel. Do not debut new shoes.
Why do my feet blister worse on long runs than short ones?
Feet swell over distance. A shoe that fits at rest can be a size too small at 30km, and then your toes are pressed into the front on every stride. Going up a size is what fixes most recurring long-run blisters.
My toenail has gone dark.
That is one for a podiatrist.
How long do I leave a patch on?
Change it only when it will not stay on anymore. Peeling one off early takes the new skin with it.
When should I see a doctor?
Spreading redness, heat, swelling, or yellow or green pus. That one needs a doctor.
Burst-blister care follows NHS guidance. Anything we have not covered, email hello@mendpatch.nz — a real person will reply.