🚨 Important: Suturing wounds yourself is a last resort for crisis
situations when no medical help is reachable. Emergency call (112/911) always comes first! Improperly
sutured wounds can cause infections, scars and permanent damage. When in doubt: irrigate, dress and
use closure alternatives (Steri-Strips, wound glue) instead.
1. When to suture — and when not to
A suture is worthwhile when a wound gapes and would otherwise heal poorly or with heavy scarring. Ideal candidates are fresh, clean-edged cuts.
Good candidates
- Fresh, clean wounds (less than 6–8 hours old)
- Clean, gaping cuts (e.g. knife or glass injuries) with bleeding under control
- Wounds on the face (within 24 hours, cosmetically important)
- Long tear/cut wounds on arms, legs and scalp (except the jaw)
Do NOT suture (treat the wound open!)
⚠️ Keep your hands off the needle with: puncture and bite wounds,
heavily soiled wounds, wounds containing foreign bodies, infected wounds
(redness, pus, warmth), gunshot wounds, wounds older than 12 hours (exception: face up to 24 h),
visible organs or fat from the abdomen or chest, and wounds with visible tendons, joints or bone.
These wounds must be treated open and seen by a doctor — suturing seals germs inside!
Gentle alternative first: pull the wound edges together with Steri-Strips (adhesive strips) or wound glue. This is less invasive, painless, needs no needles — and is entirely sufficient for many shallow wounds. Suturing is only necessary when the edges will not stay together otherwise.
2. Materials: The suture kit
| Material | Purpose | Note |
|---|---|---|
| Suture material (thread + needle) | Wound closure | Monofilament threads (nylon/prolene) for skin; sizes 4-0/3-0 (body), 5-0/6-0 (face) |
| Needle holder | Hold & guide the needle | In an emergency fine forceps work, but far worse |
| 2 forceps (smooth/surgical) | Grip wound edges | Not toothed (traumatizes tissue) |
| Scissors (blunt/sharp) | Cut threads, trim dressings | A separate thread scissors is ideal |
| Sterile gloves | Infection control | Nitrile, 2 pairs |
| Disinfectant | Skin & wound | Octenidine or povidone-iodine; alcohol or hydrogen peroxide NEVER into the wound! |
| Sterile gauze, roll bandages | Irrigation & dressing | Several packs |
| Saline (0.9 %) or clean water | Wound irrigation | Boiled drinking water suffices in emergencies |
| Syringe (20 ml) or wound irrigator | Pressurized irrigation | Pressure flushing removes debris from the depth |
| Local anesthetic (if available) | Pain reduction | Lidocaine 1 %, syringe + needle — without it suturing is very painful |
| Face mask, cap, headlamp | Sterility & visibility | Good lighting is half the work |
Understanding suture material
- Non-absorbable (nylon, prolene, silk): threads must be removed later. Standard for skin sutures.
- Absorbable (vicryl, PGA): dissolves by itself (weeks to months). Practical when follow-up is unreliable, inside the body and for children.
- Monofilament (smooth thread): glides well, little germ adhesion — preferred for skin sutures.
- Needles: curved, cutting needles for skin (pierce the tough skin), round-bodied needles for soft tissue.
- Size rule: as fine as possible, as strong as necessary — face 6-0/5-0, hand 5-0, arms/legs 4-0/3-0, scalp/torso 3-0.
Improvised alternatives
- Steri-Strips / wide tape: pull wound edges together, apply across the wound
- Wound glue: medical tissue adhesive (cyanoacrylate) on degreased, dry, joined edges — never into the depth of the wound!
- Skin stapler: fast but crude — practical for scalp and high-stress areas
- Nylon fishing line + curved needle (from boiled tools): last resort, only if nothing else exists — mind sterility!
Checklist: Emergency suture kit
- ☐ 2–3 suture packs (3-0 + 4-0 nylon/monofilament, with needle)
- ☐ Needle holder, 2 forceps, scissors
- ☐ Sterile gloves (2 pairs), face mask
- ☐ Disinfectant (octenidine/povidone-iodine) + sterile gauze
- ☐ Saline/wound irrigation + 20 ml syringe
- ☐ Steri-Strips, wound glue, plasters, roll bandages
- ☐ Headlamp + spare light
- ☐ Painkillers (ibuprofen/paracetamol)
- ☐ Notepad + pen (wound diary)
3. Preparation: hygiene comes first
🧼 The wound infection starts with the preparation. Cleanliness matters more than the perfect stitch!
- Wash and disinfect hands, put on sterile gloves (change after touching non-sterile surfaces!)
- Irrigate the wound: flush generously with saline or boiled, lukewarm water under pressure (at least 300–500 ml) until no debris is visible
- Disinfect: wound edge and surroundings generously with octenidine/povidone-iodine; let the wound surface dry briefly
- Foreign bodies: remove loose particles with sterile forceps. Do NOT pull out deeply embedded objects! (can trigger fatal bleeding)
- Trim: shorten surrounding hair with scissors — never shave (micro-injuries = germ bridges)
- Hemostasis: press directly on the wound for 2–3 minutes until dry. Small spurting vessels: press with a sterile pad
- Pain relief: if lidocaine is available: inject 1–2 ml under the wound edge on each side, wait 3–5 minutes
- Position & light: lay the patient down (circulation), illuminate the wound well (headlamp), helper for materials and distraction
4. Procedure: step by step
4.1 Align the wound edges
The wound edges must lie together without tension and without shifting — like a broken object assembled exactly. Misalignments (e.g. along skin lines, eyebrows, lip border) lead to visible scars.
4.2 The halving method
- First stitch in the middle of the wound — divides the wound into two halves
- Next stitches always in the middle of the remaining segments (middle left, middle right …)
- This distributes any edge inequality evenly across segments instead of "tipping" at one end
4.3 Distances
| Region | Distance stitch–wound edge | Distance stitch–stitch |
|---|---|---|
| Face | 2–3 mm | 3–5 mm |
| Hand/fingers | 3–5 mm | 4–6 mm |
| Arms, legs | 5–10 mm | 8–10 mm |
| Scalp/torso | 8–10 mm | 10–12 mm |
4.4 Technique of a single stitch
- Insert the needle perpendicular (90°) to the skin, about one needle diameter from the wound edge
- Guide along the needle's curvature through the tissue (do not bend it!)
- Exit on the opposite side with the same distance and depth — the edges must end up level
- Pull the thread through, tie 3–4 throws, place the knot beside the wound (don't press on the edges!)
- Tight enough that the edges just touch — do not strangle (white, squeezed edges = tissue death)
- Trim thread ends to 5–10 mm
⚡ Golden rule: Better one clean, slightly gaping stitch than a tightly
strangled one! Tense sutures cut into swollen tissue and leave stepped scars. After placing:
cover the wound antiseptically and let it rest for 2–3 minutes — if the edges
drift apart (swelling), re-check the stitch.
5. Suturing techniques at a glance
| Technique | Use | Advantage | Drawback |
|---|---|---|---|
| Simple interrupted suture (standard) | Almost all wounds | Robust; one loosened stitch doesn't endanger the whole wound | Time-consuming |
| Continuous suture | Small, clean-edged wounds; scalp | Fast, even tension | If one point slips, the whole suture gapes |
| Vertical mattress suture | High-tension areas, thick edges (e.g. over joints) | Everts edges, deep tissue anchoring | Needs practice, scar-prone |
| Horizontal mattress suture | Tension-prone areas, thin edges | Large tissue bite, fast | Tends to strangulate edges |
| Subcuticular suture | Cosmetic, clean-edged wounds (thread under the skin) | Nearly scar-free | Challenging without practice |
Suturing techniques are ancient — the plate below comes from a medical lexicon of 1884 and shows classic stitch variants, many of which are still in use today:
5.1 Simple interrupted suture (the standard technique)
- Insert the needle perpendicular at the wound edge (approx. 5–10 mm away, depending on region)
- Pass under the wound base, exit on the opposite side at the same depth
- Knot: first a double wrap (surgeon's knot), then 2–3 simple throws, pulled across
- Place a new stitch every 5–10 mm until the wound is completely closed
5.2 Continuous suture
Start like an interrupted stitch, then without a knot go diagonally to the opposite side and continue along the wound. Finish with a knot at the last thread end. Caution: keep tension even — too tight and the suture cuts in when swelling starts.
5.3 Vertical mattress suture (Donati)
Insert far from the edge (approx. 1 cm), pass deep under the wound base to the opposite side, return on the entry side close to the edge, cross the wound, exit on the far side close to the edge and re-enter far away. Result: edges are everted and anchored deep. Ideal for high-tension areas (knee, elbow, back).
6. After suturing: immediate measures
- Disinfect + dry, non-tensioning dressing (gauze + roll bandage, no cotton wool directly on the wound)
- Immobilize: near joints = splint (magazine, template), otherwise elevate for 24–48 hours (less swelling = better healing)
- Check tetanus! Last vaccination > 5 years (dirty wound) or > 10 years (clean wound) ago → arrange a booster as soon as possible
- Wound diary: date, location, cause, number of stitches — basis for suture removal and follow-ups
- First wound check after 24–48 hours: change dressing, inspect edges, look for infection signs
7. Observing wound healing
7.1 Healing phases
| Phase | Period | What happens | Normal signs |
|---|---|---|---|
| Inflammatory phase | Day 1–4 | Hemostasis, germ defense, wound cleansing | Mild redness, warmth, pulsing, clear serous fluid |
| Proliferative phase | Day 3–10 | New tissue, vessels grow, wound contracts | Redness fading, edges adhere, possibly itching |
| Remodeling phase | from day 8 | Collagen hardens, scar stabilizes | Scar reddish → paler, feels tight |
7.2 Daily check: normal or infection?
| Sign | Normal ✅ | Infection ⚠️ |
|---|---|---|
| Pain | Clearly better by day 2–3 | Increasing, pulsating, worsening after day 3 |
| Redness | Thin, pale rim, receding | Spreading (>1 cm), hard, hot |
| Discharge | Clear, yellowish-transparent, little | Cloudy-purulent, foul-smelling, increasing |
| Swelling | Strongest on days 1–2, then receding | Growing, tense, sutures dig in |
| Temperature | Normal | Fever > 38 °C, chills |
| Surroundings | Skin normal | Red streaks toward the heart (lymph vessels!), swollen lymph nodes |
🚨 Seek medical help as soon as reachable: fever > 38.5 °C, red streaks,
strongly swelling wound, pus or foul smell, sutures loosening while swelling grows. Until then:
remove/loosen sutures in the affected area, keep the wound open (drain), antiseptic gauze,
immobilize, drink plenty.
7.3 Removing sutures — when?
| Body region | Suture removal |
|---|---|
| Face | Day 5–7 |
| Scalp/torso | Day 7–10 |
| Arms/hands | Day 10–14 |
| Legs | Day 10–14 |
| Joints/sole/high-stress areas | Day 14–21 |
The longer the sutures stay, the safer the wound — but the stronger the suture marks (thread holes). Face as early as possible, high-stress areas as late as possible.
7.4 Removing sutures — how it's done
- Clean the dressing area and suture zone with disinfectant, put on gloves
- Lift the knot with sterile forceps and expose the thread segment crossing the wound edge
- Insert the scissors close to the skin under the knot and cut the thread — so no contaminated thread side remains under the skin
- Pull the thread by the knot parallel to the skin toward the wound edge (never straight up — tears the wound open!)
- Disinfect again, apply Steri-Strips across if needed, keep dry for 24 hours
8. Supporting wound healing
Nutrition & lifestyle
- Protein (meat, eggs, legumes, dairy): building material for new tissue — especially important in crisis times
- Vitamin C (citrus fruits, sauerkraut, peppers, wild plants): collagen build-up
- Zinc (meat, cheese, whole grains, pumpkin seeds): cell renewal & immune defense
- Drink plenty (2–3 liters), don't smoke (nicotine cuts tissue oxygen and delays healing by days to weeks)
- Blood sugar: diabetics face many times the healing problems — check the wound daily
Wound care
- Rest: elevate and spare limbs 24–72 h, splint near joints
- Dressing changes daily or when soaked, always with clean/sterile materials and hand hygiene
- Keep moist, don't let dry out: wound edges under the suture should not crust over; a thin layer of antiseptic ointment on the surroundings (not into the wound) prevents thread cutting in
- No ointments on freshly sutured, closed wounds unless needed — the suture already closes it
- Scar care after healing: gentle massage for 8–12 weeks + sun protection (at least 12 months — otherwise the scar stays darker)
9. Complications & what to do
| Complication | Recognize | Act |
|---|---|---|
| Wound infection | Spreading redness, pus, pain, fever | Remove sutures in the affected area, treat open with antiseptics, antibiotic if available, seek a doctor |
| Dehiscence (wound gapes again) | Torn threads, open gap | Fresh/clean: Steri-Strips; inflamed: never re-suture, treat open |
| Suture strangulation | White pressure marks, threads cutting in | Early suture removal if possible, otherwise loosen individual stitches early, secure with Steri-Strips |
| Hypertrophic scar/keloid | Bulging, growing scar after healing | Silicone plasters/gel, sun protection, pressure massage — usually recedes over months |
| Scar contracture | Tension/movement restriction over joints | Scar massage + stretching exercises after healing, physiotherapy if available |
10. Did you know?
- Suturing is millennia old: ancient Egyptian sources (c. 1550 BC, Ebers Papyrus) describe wound sutures, and in India wounds were stitched as early as the 6th century BC with fine needles and threads.
- The classic surgical thread made of catgut (intestine strands) was only replaced by synthetic threads in the 20th century.
- Ambroise Paré (16th century) made ligature (tying off blood vessels) instead of cauterizing with boiling oil the standard — a milestone in wound surgery.
- The simple interrupted suture used today is the oldest and most frequently used suturing technique worldwide — robust enough for every layperson's crisis case.