Sore That Won’t Heal: The 4-Week Skin Check and When to Book a GP
Tracking one sore or spot for four weeks at home shows whether it is healing, and gives the doctor a clear timeline to work from. The check takes a few minutes a week and needs only a phone, a coin for scale and a dated note. It does not diagnose anything, and it is not meant to replace a clinician. Here is how to run the check, what each result means, and when to book a GP without waiting for the four weeks to finish.
The short version
- Start the clock: the day you first noticed the sore, spot, scab or crust
- Photograph it weekly: same light, same distance, with a coin beside it for size
- Check at four weeks: closed and fading is on track; still open, bleeding, crusted or growing means book a GP
- Do not wait out a change: a spot that heals and returns in the same place is a reason to book
- The rule to repeat: a sore that does not heal should be seen by a GP as soon as possible, even when it does not hurt
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Why track a sore for four weeks?
Cancer Research UK advises speaking to a GP as soon as possible about an unexplained skin change that does not heal, and says the symptom might not be due to cancer, which is exactly why a doctor should make the judgement rather than a search engine or a home remedy. The four-week mark in this check is a practical tracking point chosen for the photo log, not an official cut-off, so a sore still open after four weeks is a clear reason to book.
The four-week figure is a trigger for an appointment, not a verdict on what the sore is. Plenty of causes are harmless and treatable, and only an examination can sort them out.
How do you run the four-week check at home?
- Write the start date. Record the day you first saw the sore or spot in your phone notes or on a calendar, because the four weeks count from that day.
- Take a photo that week. Use the same light, the same distance and the same angle each time, with a coin beside the sore so the size can be compared later.
- Look closely. Note whether it is smaller, the same or larger, whether it is still open, crusted, scabbed, bleeding, itchy or painful, and whether the edges look closed over.
- Write one line a week. For example: “Day 14: smaller, still crusted at the centre, no bleeding, no new spots nearby.” Short, dated lines are more useful than a long diary.
- Decide at day 28. Use the table below, and book the GP appointment if the result falls in the second or third row, or if you are not sure which row fits.
| Where the sore is at four weeks | What it tells you | What to do |
|---|---|---|
| Closed over and getting smaller, with no bleeding | On track for a normal healing timeline | Keep the photo log for another two weeks and stop if it stays closed |
| Still open, crusted or scabbed, or no smaller | Not healed within the four-week window | Book a GP appointment this week |
| Bleeding, growing, changing shape or colour, or getting more painful | A change that needs prompt assessment | Book a GP appointment at once, and do not wait for day 28 |
A sore that does not heal should be seen by a GP as soon as possible, whatever it looks like.
The photo log that saves the GP visit
Keep the dated photos in one folder on your phone, and label each with the day number. A GP can see the change in seconds when the pictures are in order, and the appointment is spent on the examination rather than on a guess about the timeline.
What can throw off the reading?
A home check can be misled by the same things that slow ordinary wounds, or by how the sore is looked at. These are the common ones:
- Picking, scratching or pressing the scab, which reopens the sore and resets the count.
- A spot on the foot, the shin or a bony area that rubs against shoes, clothes or a bed.
- Regular sun exposure on the same patch, which can make the colour and edges hard to judge.
- Smoking and conditions such as diabetes, which can slow healing and change the picture, so the check needs a clinician rather than a timer alone.
- Creams, plasters or make-up that cover the sore, so the colour and edges cannot be seen in the photo.
- Photos taken in dim or warm light, which make a scab look darker or a healing edge look redder than it is.
When should you not wait for the four weeks to finish?
Four weeks is the outside line for booking, not a reason to hold off when something is clearly wrong. Some changes call for an appointment at once, and an urgent route if the warning signs are severe.
Bleeding that does not stop with gentle pressure, a sore that is growing quickly, pain that gets worse, redness spreading outward, a fever, or a spot that heals and then comes back in the same place. Call your local emergency number if you feel faint, or if bleeding is heavy and will not stop. This check helps you describe the sore to a clinician, and it cannot rule anything out at home.
What should you tell the GP?
Bring the start date, the photo log and the one-line weekly notes. Say where the sore is, whether it has bled, hurt, itched or crusted, and whether you have had anything similar before. Mention any medicines you take and any long-term conditions, including diabetes, because they change how a sore heals. Do not start a new cream, plaster or remedy on the sore until the GP has seen it, since a product can hide the change they need to judge.
A sore on the lip is a different question with a usual pattern, covered in Cold Sores and Bukhar Ke Chhale: Lip Care That Helps. A blister from new shoes is covered in Shoe Bite (Joota Katna): Blister Care Step by Step. Changes in an existing mole need their own check, set out in Mole Skin Self-Check: Photos and a Body Map. Slow healing linked to diabetes is discussed in Hijama for Diabetics: The Wound Healing Risk Nobody Explains. The full category is at Skin and Beauty.
Questions about a sore that will not heal, answered
Is a sore that will not heal always cancer?
No, many causes are harmless, but a sore that does not heal should still be seen by a GP. Only an examination can tell the causes apart.
Can a sore that will not heal be skin cancer?
It can be, which is why four weeks is the point to book a GP. A clinician will look at the sore and decide whether any further tests are needed.
How long is too long for a sore to heal?
There is no official cut-off in the sources used here, so do not wait for a deadline. This check uses four weeks, counted from the day you first noticed it, as the point to book if the sore is still open, crusted or bleeding.
What causes a sore that will not heal?
Many things can, including skin conditions, infections, repeated rubbing, slow healing linked to diabetes or circulation, and skin changes that need a closer look. A doctor works out which applies.
Should I wait a bit longer if the sore looks smaller?
If it is smaller and closing over, you can keep logging it, but the four-week date still stands. A sore that is shrinking and fully closed is on track, while one still open at four weeks needs a GP.
Will an over-the-counter cream fix a sore that will not heal?
Not reliably, and a cream can hide the colour and edges the GP needs to see. Ask the GP before putting anything on the sore.
Does a painless sore still need a check?
Yes. A sore can be painless and still need an appointment, because pain is not a reliable guide to what a sore is.
What if a sore heals and then comes back in the same place?
A recurring spot in the same place is a reason to book a GP, even if the earlier sore healed. Bring the dated photos from both episodes.
What should I bring to the GP appointment?
Bring the start date, the dated photos with the coin for scale, your weekly notes, and a list of medicines and long-term conditions. Clear notes help the clinician see how the sore has changed.
Bottom line for the four-week check
Note the start date, photograph the sore each week beside a coin, and decide at day 28. A sore that has closed and is fading is on track. A sore that is still open, bleeding or growing is a reason to book a GP. The rule to keep is plain: a sore that does not heal should be seen by a GP as soon as possible, even when it does not hurt.