Blisters and rubbing
A blister is the skin's answer to repeated friction: the layers separate and the gap fills with fluid, which cushions and protects the tissue underneath.
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Medicines commonly prescribed for Blisters and rubbing
For informational purposes only. Always consult a doctor before using any medicine.
Dosage form: CREAM, 0.5 mgActive substance: betamethasoneManufacturer: Galenicum Derma S.L.U.Prescription requiredDosage form: TOPICAL SOLUTION, 0.1% w/w betamethasoneActive substance: betamethasoneManufacturer: Industrial Farmaceutica Cantabria S.A.Prescription requiredDosage form: TOPICAL SOLUTION, 30 mg/mlActive substance: hydrogen peroxideManufacturer: Peroxfarma S.A.Prescription not required
A blister is the skin's answer to repeated friction: the layers separate and the gap fills with fluid, which cushions and protects the tissue underneath. It is a protective mechanism, and that gives the basic rule: if you can, do not open it. The skin covering it is the best sterile dressing there is.
Why they form
- new, badly fitting or overly rigid footwear;
- long walks, running, sport;
- socks with seams, rucked-up socks or wet cotton socks;
- moisture: a sweaty or wet foot rubs far sooner;
- manual work without gloves: spades, tools, weights;
- burns, including sunburn;
- frostbite;
- reactions to plants and chemicals;
- some infections and skin conditions, when blisters appear without any mechanical cause.
What to do
- if it is intact and not troublesome: leave it alone. Cover it with a hydrocolloid dressing or gauze and tape and let it heal on its own within 3–7 days;
- if it is large, tense and painful, or in a place where it will burst anyway, it can be drained. Wash your hands, clean the skin with antiseptic, use a sterile needle, pierce at the lower edge and press gently. Leave the skin in place — do not trim it;
- if it has already burst: wash with soap and water, trim only the loose detached skin, apply an antibiotic ointment if indicated and cover;
- change the dressing daily and whenever it gets wet;
- avoid further rubbing until it heals;
- pain relief if needed.
What not to do: open it with an unsterilised needle, tear off the covering skin, apply spirit or iodine directly to raw skin, or stick tape straight onto the blister with nothing underneath.
When to see a doctor
- the redness is spreading around it, with swelling, warmth, increasing pain, pus or a bad smell — infection;
- there is fever or red streaks towards the nearest lymph node;
- the blister is very large or there are several;
- it followed a significant burn or frostbite;
- you have diabetes, neuropathy or circulatory problems — in that case always seek advice rather than treating it yourself;
- it has not healed within two weeks;
- blisters appear without any mechanical cause or keep recurring — there may be an underlying skin condition;
- the blister contains blood and is in a weight-bearing area.
How to prevent them
Almost all blisters are preventable, and by very simple means.
- correctly sized footwear, worn in before a long walk;
- technical socks that wick moisture away; wet cotton is the worst material;
- seam-free socks pulled smooth, with no rucks;
- on long routes, change socks halfway through;
- pre-tape the spots where you always get blisters, with fabric tape, dressings or a wrap;
- anti-friction powders or balms on the areas prone to it;
- stop as soon as you notice a "hot spot": an area that starts to burn is a blister that has not formed yet, and dealing with it at that moment prevents the problem;
- gloves for manual work and for the gym;
- keep insoles dry and alternate footwear.
Blisters and calluses are different things
A blister is the acute response to friction; a callus is the chronic one, a thickening of the skin from sustained pressure. If you repeatedly get blisters in the same spot and a callus then forms there, the problem lies in the biomechanics of your foot or in your footwear, and it is worth having that assessed rather than treating each episode separately.
Common questions
Is it better to open it or leave it? Leave it whenever you can. Intact skin protects against infection and healing is faster.
Can I keep walking with a blister? If you have to, cover it with a hydrocolloid dressing and offload the area with a felt ring around it.
Does threading it with a needle and thread work? No. That old method leaves an open route for bacteria.
Why is my blister full of blood? The friction has reached a deeper level with small vessels. It is not serious, but keep an eye on it and do not open it.
What if I have diabetes? Do not treat it yourself. Any foot lesion deserves medical assessment.
Online consultation
In an online consultation the doctor reviews photographs, advises whether to drain the blister or leave it, recognises signs of infection, explains how to dress it step by step, and helps find the cause if you always get blisters in the same place.
This material is for information only and does not replace a medical consultation.
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Reviewed on Jul 15, 2026
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