# Marks and bruising > How long spanking marks and bruises last, why some people bruise far more than others, what actually helps, and the signs that mean you need medical help. - Canonical URL: https://consensualspanking.co.uk/guide/marks-and-bruising/ - Section: Safety and practice - Updated: November 2026 (2026-11-01) - Audience: consenting adults over 18 only. Everything on this site concerns consenting adults over 18. Marks are the part people worry about afterwards and forget to discuss beforehand. The timeline is fairly predictable once you know it, the folk remedies mostly do not work, and there are about six things that mean stop reading and get seen. --- ## In short - Redness arrives in minutes. Bruising usually appears 12–48 hours later and is often worst on day two. - Ordinary bruising fades over roughly one to two weeks. Cane tramlines last longest and are the most recognisable mark. - Anticoagulants, aspirin, long-term steroids, alcohol, thin or fair skin and age all increase bruising, sometimes a lot. - Blood in urine after any contact near the lower back is a same-day emergency, not something to sleep on. Everything below concerns marks left during agreed activity between consenting adults over 18. ## The timeline | What | When it appears | How long it lasts | | --- | --- | --- | | Redness | Seconds to minutes | An hour or two, sometimes half a day | | Raised welts | Within minutes | Settle over a few hours, may leave a bruise | | Bruising | 12 to 48 hours | Roughly one to two weeks | | Cane tramlines | Minutes for the line, a day for the bruise | Two weeks, sometimes longer | Redness is blood flow, not damage, and it is a poor guide to anything. Bruising is the one that catches people out, because it does not turn up on the night. Blood carries on leaking into the tissue after the impact and then has to reach a depth where you can see it, which is why day two frequently looks worse than day one and why nobody should be evaluating a session by what the skin looks like before bed. Colour follows a fairly reliable sequence: red or dark purple first, then blue, then green, then a yellow-brown before it goes. Bruises also drift downwards with gravity, so a mark that started high on the buttock can end up noticeably lower a week later. Cane marks behave differently, as described in [implements](https://consensualspanking.co.uk/guide/implements/): a pale line where the cane compressed the tissue, with bruising along either side of it. It is the most identifiable mark there is and it is the slowest to go. ## Why some people mark and others barely do - The implement. Broad and heavy produces deep bruising that arrives late. Narrow and fast produces welts and, past a point, split skin. - Skin and build. Thin skin, fair skin and less subcutaneous fat all mark more readily. Some people bruise from a firm grip on the arm and it says nothing about their health. - Age. Skin thins and small blood vessels get more fragile over time, so marks come more easily and clear more slowly. This is a real change from thirty to fifty, not a stereotype. - Medication. Anticoagulants (warfarin, apixaban, rivaroxaban and similar), aspirin, clopidogrel and long-term steroids all increase bruising, sometimes dramatically. So do fish oil supplements at high doses. If you take any of these, say so during negotiation and treat heavy impact as off the table until you have spoken to a doctor. This is not squeamishness. A blood thinner genuinely changes what a bruise is. - Alcohol. It dilates blood vessels, so more bruising, and it degrades everyone's judgement at the same time. - Warm-up. A properly warmed backside marks differently, and generally less badly, than a cold one taking the same force. ## What actually helps Cold on the night, briefly. A gel pack or a bag of frozen peas wrapped in a tea towel, held there for about ten minutes with a proper gap before you do it again, reduces how much blood leaks into the tissue while the vessels are still open. Ice against bare skin is a bad idea: it can burn, and there is nothing to be gained from a long session with it. Two or three short spells before bed is the whole of it. Warmth comes later, once the first day or two has passed and the bruise has settled. Heat while blood is still leaking makes the area worse. Heat after that brings circulation to it, and circulation is what carries a bruise away, so the warm bath on Monday does more for a Saturday session than the same bath would have done on the night. The very hot one at midnight feels wonderful and costs you a darker mark, so save it. Moisturiser genuinely helps skin that has been repeatedly struck, particularly after canes, applied daily for a few days rather than once. Arnica is the thing everybody recommends and the evidence for it is weak and mixed. The trials are small, they do not agree with one another, and I am not going to tell you it works. A great many people use it and it is unlikely to do you any harm on unbroken skin. I keep a tube in the house. I would not rely on it, I would not put it on anything that has split, and the honest reason it stays in the drawer is that someone gently rubbing cream into a sore backside is a good part of the following morning whatever is in the tube. Painkillers are the part most people get backwards. Ibuprofen and aspirin are anti-inflammatory drugs that act on platelets, which are part of how bleeding stops, so taking either one after a heavy session can leave you with worse or more extensive bruising than you would otherwise have had. Paracetamol does not work that way, and for ordinary soreness the next day it is the more sensible choice. That is general information and not medical advice. If you take anything prescribed, ask a pharmacist, who will answer properly and for nothing, rather than taking the word of a website about spanking. Move about. This is the one people underestimate, myself included. The instinct after a hard session is to lie face down and stay there, and two days of that leaves everything stiffer and sorer than it needed to be. Walk to the shop. Sit down properly instead of perching on one hip all week. Nothing energetic is being asked for. Gentle ordinary movement through the following day makes a real difference to how the second and third day feel. Some things make it worse. Rubbing hard at a fresh bruise pushes blood further through the tissue instead of dispersing it, and it hurts more than the stroke did, so leave firm massage until the colour has turned yellow. The very hot bath on the night belongs here too. So does drinking, which is the one people argue about. Alcohol widens the blood vessels, so a heavy night on top of a heavy session gives you a worse mark by morning, and it thins nobody usefully. All of this assumes ordinary marks in an ordinary week. A bruise still growing after two days, an area gone hard and tight, skin that will not close, or blood in your urine is a different question, and the answer is under when to get medical help further down. ## Concealment, and having the conversation first Buttock marks are easy. They sit under everything, nobody sees them, and you can go about a normal week without a thought. Thighs are a different problem entirely. Thigh marks show in shorts, in a swimming costume, in a communal changing room, at a physio appointment, on a beach, at a smear test. Upper arms and hands are worse again, because they are on display in an ordinary office. People agree to thighs on a Saturday evening, in a state where it seems like a small detail, and then remember Wednesday's swim. So it belongs in the negotiation rather than in the aftermath. The questions that get useful answers are concrete ones: what are you doing in the next two weeks, who sees you undressed, is there anyone in your life who would react badly to finding a bruise, and are you happy for marks to show above the knee. Vague agreement about "marks are fine" is not agreement about anything. If you live with someone who does not know about this part of your life, plan for it before rather than after. That is a bigger subject than this page, and [asking your partner](https://consensualspanking.co.uk/guide/asking-your-partner/) is the relevant one. ## Photographs If marks are going to be photographed, settle whose phone, where the images live and when they get deleted before the session, not while someone is lying face down. Pictures of yourself are your own business. Pictures of somebody else are a matter of trust, and sharing intimate images of a person without their consent is a criminal offence in England and Wales. ## When to get medical help > **Same day, urgently.** Blood in your urine after any contact near the lower back or flank. That is a possible kidney injury and it needs assessment now, not tomorrow. The same applies to severe pain in the flank or abdomen, feeling faint, or vomiting after impact in that area. Get seen, less urgently but properly, for any of these: - Broken skin that will not close, or that keeps reopening. - Signs of infection: redness spreading outward from a wound, heat, swelling that increases after day two, pus, or feeling generally unwell or feverish. - A bruise that keeps growing after 48 hours, or an area that becomes hard, tight and disproportionately painful. That can be a haematoma. - Numbness, pins and needles, or weakness that is still present the next day. - Bruising wildly out of proportion to what happened, or bruises appearing elsewhere with no cause. Worth a GP appointment for reasons that have nothing to do with kink. > **Talking to a clinician.** You do not owe anyone the context. "I was hit with a wooden paddle on Saturday" is a complete description of the mechanism and it is the part they need. Clinicians are obliged to consider whether a patient is being hurt against their will, so you may be asked, possibly on your own. That is the system working properly rather than an accusation. Answer straight and it goes no further. > ## If the marks were not agreed > > > > If you have marks you did not consent to, or you consented under pressure, or someone has ignored a limit you set, that is not a kink problem. The National Domestic Abuse Helpline is 0808 2000 247, free and 24 hours. The Men's Advice Line is 0808 8010 327. The Samaritans are on 116 123 at any hour. See also [consent and coercive control](https://consensualspanking.co.uk/discipline/consent-and-coercive-control/). ## The legal footnote Under *R v Brown* [1993], consent is not a defence to actual bodily harm in England and Wales. Transient redness and light bruising generally sit below that line. Heavy, extensive or lasting bruising can cross it, and broken bones and wounds needing treatment do. It is one more reason to take the timeline above seriously rather than judging by what you can see on the night. More at [is it legal in the UK](https://consensualspanking.co.uk/uk/is-it-legal/). ## Read next - [Skin conditions, tattoos and scars](https://consensualspanking.co.uk/guide/skin-conditions/) - [Where it is safe to strike](https://consensualspanking.co.uk/guide/where-it-is-safe-to-strike/) - [Aftercare](https://consensualspanking.co.uk/guide/aftercare/) - [Negotiation](https://consensualspanking.co.uk/guide/negotiation/) - [Should I tell my GP or therapist?](https://consensualspanking.co.uk/questions/should-i-tell-my-doctor/) ## Sources 1. *R v Brown* [1993] UKHL 19, House of Lords. [bailii.org](https://www.bailii.org/uk/cases/UKHL/1993/19.html) 2. NHS guidance on bruises, wounds and kidney injury, [nhs.uk](https://www.nhs.uk). > **Not legal advice.** Where this page mentions the law, it is general information written from an England and Wales position unless it says otherwise, and it is not legal advice. Scotland and Northern Ireland have their own law. If your own legal position matters, speak to a solicitor. ## Common questions ### How long do spanking bruises last? Redness appears within minutes and usually clears in a few hours. Actual bruising tends to appear 12 to 48 hours later and is often worse on the second day than the first, then fades over roughly one to two weeks through purple, blue, green and yellow-brown. Deep bruising from a heavy paddle, and cane tramlines, can take longer. ### Why is the bruise worse the day after? Because blood keeps seeping into the tissue after the impact and then has to work its way to the surface before you can see it. People frequently go to bed thinking nothing much happened and wake up a morning or two later looking far worse. Judge a session by how it felt, not by what the skin looks like at midnight. ### Does arnica actually work on bruises? The evidence is weak. Trials of topical arnica are small, inconsistent and mostly do not show a meaningful effect on ordinary bruising. It is popular, it is harmless on intact skin, and gently rubbing cream into a sore backside is pleasant regardless of what the active ingredient is doing.