A healing wound itches because of histamine release, nerve regrowth, and dry skin. Avoid scratching it.
Why
- Histamine release.
- Nerves regrowing.
- Dry skin around the wound.
- Increased blood flow.
Sign of healing
Itching usually shows that healing is on track.
Relief
- Keep the wound moist and clean.
- Cold compress.
- Don’t scratch.
- Antihistamine if needed.
See a doctor
If you see redness, pus, warmth or fever, which suggests infection.
Biology of itch in wound healing
Itching during healing is tied to the inflammatory and proliferative phases. Histamine and cytokines released at the injury irritate nerve endings, and new nerve fibers regrow, sending signals that feel like itch. Dry skin as scab forms adds to this feeling. Wound healing occurs in phases: hemostasis (minutes), inflammation (days 1 to 4), proliferation (days 4 to 21) and remodeling (up to a year or more).
- A study of itch in burn patients found that up to 87 percent reported itching.
- Scratching can reopen wounds, delay healing and raise infection and scarring risk.
- Silicone gel or sheets can reduce scar itch and thickness.
Relief
Keep the area clean and moisturized with petrolatum, apply a cool compress for 10 minutes, and cover with a bandage to reduce scratching. Oral antihistamines may help when itch is intense. See a doctor if there is redness spreading, warmth, pus, fever, or itching with a rash across the body, which may signal infection or an allergic reaction to adhesives or ointments such as neomycin.
Biology of itch
Itching during wound healing is linked to histamine release, growth factors and regrowth of nerve endings. Inflammatory cells and new tissue formation stimulate itch nerves.
Relief
Keep the wound moisturized, avoid scratching, use cool compresses and consider antihistamines. See a doctor if redness, pus, warmth or fever appear, which may signal infection.
Phases of wound repair
Healing has four phases: hemostasis (minutes), inflammation (days 1 to 4), proliferation (days 4 to 21) with new tissue and nerve regrowth, and remodeling (weeks to a year). Itching peaks during proliferation as mast cells release histamine and as C fibers regenerate.
Care to reduce itch
Keep wounds clean and moist with petroleum jelly, avoid scratching and cover with a bandage. Cold compresses, oral antihistamines or silicone gel sheets for scars may help. Seek care for redness spreading more than 2 cm, warmth, pus, fever or red streaks. Tetanus boosters are advised every 10 years.
Based on data from the American Academy of Dermatology and the NIH
