First aid for cuts starts with pressure and clean water, not with a judgement about whether the injury looks bad enough to treat. The amount of blood tells you very little about which of those wounds matters. The shape of the damage tells you far more, because skin that has been sliced open behaves differently from skin that has been torn or punched straight through.
The Differences Between A Graze, Cut, Laceration, and an Open Wound
An open wound is any injury where your skin has been broken and the tissue underneath is exposed to the air. How your skin came apart changes how the wound behaves over the fortnight that follows, so first aid for cuts begins with what happened rather than with how bad the injury looks. Minor cuts and scrapes can be treated at home, but anything past the top layers of your skin needs a healthcare professional the same day.
A graze happens when your skin is dragged across a rough surface and the top layers are rubbed off. It can cover a wide area without going deep, it weeps rather than pours, and grit is ground into the surface.
A cut is a wound where your skin has been divided by something sharp, such as a knife, a chisel, or a shard of glass. The two sides are straight and close together, and because sharp objects pass through skin without resistance, the wound is deepest through its middle and shallow at either end.
A laceration is a tear rather than a slice. Your skin is split by blunt force instead of divided cleanly, so the edges are ragged and the tissue around the wound is bruised as well as open. A laceration that barely bleeds can still leave you with a higher risk of infection than a graze that weeps across your whole shin, because dirt has been pushed under the torn edges where rinsing cannot get to it.
Grazes And Scrapes
An abrasion stings more than a deeper wound because the nerve endings in the top layer of your skin are left exposed. It also collects whatever it slid along, so bitumen, gravel, sand, and grass are pushed into the surface where your body cannot get them out on its own.
Wash your hands, then rinse the wound under cool water from the tap for two or three minutes to flush out dirt or debris. Wash around the wound with mild soap and water without letting soap get into the wound itself. Do not use hydrogen peroxide or iodine. Your exposed tissue is irritated by both, and healing is slowed. If grit stays behind after rinsing, lift it out with tweezers you have cleaned with alcohol, and see your GP if you cannot get all of it out.
The rest of first aid for cuts and grazes is about the surface staying moist and covered. Pat the area dry with sterile gauze rather than cotton wool. Fibres from cotton wool are left behind in the wound. Apply a thin smear of antibiotic ointment or petroleum jelly to stop the surface drying into a hard scab, which reduces the scar left once your wound heals. Antiseptic creams are optional, and stop using one if your skin becomes red or itchy where the cream touches it.
Cover the wound with a non-adhesive dressing and keep the dressing in place with a bandage or hypoallergenic tape. Change it daily, and change it again any time it gets wet or dirty. Adhesive strip dressings pull the top layer of skin away from a graze when you take them off, so save those for cuts.
Clean-Edged Cuts
A clean-edged cut bleeds more freely than a graze because blood vessels have been opened rather than scraped. The two straight edges also mean the wound can be pulled closed, so first aid for cuts of this kind is mostly pressure and patience.
Press firmly on the wound with a clean cloth or sterile gauze. Keep pressing for at least ten minutes without lifting the pad to look. Lifting it breaks up the clot forming underneath. If the cut is on your arm or leg, raise the injured part above the level of your heart while you keep pressing.
Once the bleeding has stopped, clean the wound the way you would clean a graze, then press the edges together and keep them closed with adhesive strip dressings laid across the cut rather than along it. Cover the wound with a dressing on top and keep it dry for the first day. Change the dressing daily and check the edges each time to see that they are still together.
Some clean-edged cuts need stitches, and the window for that is hours rather than days. Go to your GP or a hospital emergency department if the edges gape open when you stop pressing, if you can see yellow fat or anything moving underneath, if the cut crosses a knuckle or joint, if it is on your face, or if the skin past the cut feels numb.
Lacerations
A laceration is caused by blunt force, so the damage extends past the opening you can see. Torn skin takes longer to close than sliced skin, the surrounding tissue is bruised, and dirt has been driven under the edges rather than staying on the surface. That combination is why lacerations become infected wounds more often than clean cuts of the same length.
First aid for cuts with torn edges follows the same order as a clean cut, but it ends earlier. Press firmly to stop the bleeding, rinse the wound gently to lift off loose dirt or debris, then cover the wound with sterile gauze. Do not scrub at the deeper dirt, and do not pull the ragged edges together with adhesive strips.
Lacerations need medical attention on the same day. The wound may need cleaning under local anaesthetic, and torn edges heal with a wider scar when nobody trims and closes them properly. Doctors and nurses can also work out how deep the damage goes, which matters on your scalp, shin, or hand, where tendon and bone are close to the surface.
Puncture Wounds
A puncture wound looks like the least of your problems and behaves like the worst. The opening is small, the bleeding is minor, and your skin closes over the top of whatever bacteria were pushed to the bottom of the track. That is why these wounds can become infected days after they have stopped hurting.
First aid for cuts of this shape is short. Rinse the surface under the tap, cover the wound with a clean dressing, and see your GP the same day. Do not squeeze the wound to make it bleed, and do not probe inside it with tweezers or a needle.
Tetanus is a bacterial infection picked up from soil, dust, and manure, and it causes muscle stiffness and spasms that start in your jaw and neck. Puncture wounds are the classic way those bacteria get in. You need a booster if your last tetanus dose was more than five years ago and the wound is deep or dirty, so a nail through the sole of your shoe on a Saturday morning is a phone call to your GP rather than a wait until Monday.
A human or animal bite is a puncture wound with a mouth full of bacteria behind it, and it needs medical assistance every time, even when the holes look tiny. A cat bite over a knuckle can put bacteria straight into the joint, which is why doctors treat bites as more serious than the size of the wound suggests.
When There Are Objects Still In The Wound
Glass, metal, wood, and fishhooks all get left behind in wounds, and the instinct to pull them out is the wrong one. Anything long enough to be gripped may also be pressing against a blood vessel it has already cut, and removing it lets that vessel bleed freely into tissue where you cannot press on it.
First aid for cuts with something stuck in the wound reverses the usual advice about pressure. Do not try to remove the object, and do not press down on it. Press around the wound instead, then pack padding around the object until the padding stands higher than the object does, and bandage over the padding. Call triple zero (000) if the object is large, if it is deeply embedded, or if the bleeding does not slow.
A splinter or a fragment of glass just under the surface is a different matter. Lift those out with tweezers cleaned with alcohol, then treat what is left as a puncture wound.
What to Do When Bleeding Doesn't Stop
Bleeding that continues after ten minutes of firm pressure is not a sign that you have done something wrong. It is a sign that the wound is deeper than it looked, that a blood vessel has been cut, or that the injured person takes blood thinners. First aid for cuts that keep bleeding is more pressure, more padding, and a phone call, in that order.
Add a second pad on top of the first and keep pressing. Do not lift the soaked pad off, because the clot underneath comes away with it. Keep the injured part raised above the level of their heart if the wound is on an arm or a leg.
Call an ambulance on triple zero (000) if blood spurts with each heartbeat, if pads soak through within a couple of minutes, or if the injured person becomes pale, cold, clammy, drowsy, or short of breath. Lay them down while you wait and keep pressing on the wound. It is better to call an ambulance than to drive someone who is bleeding heavily to a hospital emergency department, because paramedics start treatment in your driveway and can warn the hospital before they get there.
What Infection Looks Like
Wounds can become infected after the bleeding has stopped and the pain has settled down, which is why the wound is worth a proper look each time you change the dressing. Bacteria need warmth, moisture, and dead tissue, and a covered wound gives them the first two whether it is clean or not. Nothing you do at home prevents infection outright, but rinsing thoroughly at the start and keeping the dressing clean will reduce the risk of infection considerably.
Increasing pain after the first two days, redness spreading out from the edges, warmth or swelling around the wound, yellow or green discharge, a bad smell, and red streaks tracking up your arm or leg are the signs of infection to watch for. Feeling feverish or unwell alongside any of those needs same-day medical help.
Part of first aid for cuts is knowing where home treatment stops. An infected wound needs an antibiotic, and only a doctor can prescribe one. Book an appointment if the wound looks worse from one dressing change to the next, and go to a hospital emergency department instead if you have a fever or the redness is spreading while you watch it. A wound that has not healed after two weeks needs medical attention even without any signs of infection, because slow healing points to diabetes, poor circulation, or something still in the wound.
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First Aid Training For Cuts And Bleeding
We teach first aid for cuts and bleeding. You will spend the day pressing on wounds, packing padding around objects, and putting on dressings and bandages. You may patch up your own children, help a stranger who has come off a bike, and will come to know which injuries justify a trip to the emergency department. Enrol in first aid training with us and get the practice in before you need it.
FAQs
How Long Does A Graze Take To Heal?
A shallow graze can close over within a week, though it takes longer over a knuckle, knee, or elbow, where your skin stretches every time you use the joint. Age, circulation, and diabetes all stretch that timeline out.
What Should Go In A Home First Aid Kit For Cuts?
Sterile gauze squares, non-adhesive dressings, adhesive strip dressings in a few sizes, a crepe bandage, hypoallergenic tape, disposable gloves, and tweezers will handle almost anything domestic. Saline sachets are worth adding for rinsing when you are nowhere near a tap.
What Is Normal In The First Few Days Of Healing?
A thin rim of pink skin at the edges, mild itching, and a little clear or straw-coloured fluid on the dressing are all part of ordinary healing. Pain that eases each day, rather than increasing, is the clearest sign that healing is on track.
