Most minor cuts and scrapes heal within a week or two, but sometimes wounds don't follow this timeline. A wound that isn't healing can signal infection, underlying health conditions, or other factors that need attention.
Normal Wound Healing Timeline
- Immediate (minutes to hours): Bleeding stops, clot forms
- Inflammatory phase (1-4 days): Redness, warmth, swelling—this is normal
- Proliferative phase (4-21 days): New tissue forms, wound closes
- Maturation phase (21 days to 2 years): Scar remodels and fades
When Is a Wound "Not Healing"?
A wound may be considered slow-healing or chronic if:
- No improvement after 2 weeks
- Not significantly healed after 4 weeks
- Completely stalled with no progress
- Getting worse rather than better
- Keeps reopening after apparent healing
Common Causes of Poor Wound Healing
Infection
The most common reason wounds don't heal.
- Increased pain, redness, or swelling
- Pus or cloudy drainage
- Bad smell from wound
- Fever or feeling unwell
- Red streaks spreading from wound
Learn more about cellulitis and skin infections.
Poor Blood Circulation
- Peripheral artery disease: Reduced blood flow to extremities
- Venous insufficiency: Poor return of blood from legs
- Signs: Cold extremities, pale or blue skin, leg pain with walking
Diabetes
- High blood sugar impairs immune function
- Damages blood vessels and nerves
- Foot wounds are particularly problematic
- May not feel pain from wound (neuropathy)
Nutritional Deficiencies
- Protein: Essential for tissue repair
- Vitamin C: Required for collagen production
- Zinc: Important for cell division and healing
- Iron: Needed for oxygen transport to tissues
Age
- Skin becomes thinner and more fragile
- Reduced blood flow
- Slower cell turnover
- Weaker immune response
Medications
- Steroids: Suppress immune response
- NSAIDs: May slow initial healing phases
- Chemotherapy: Affects cell division
- Blood thinners: Can affect clot formation
Other Factors
- Smoking: Reduces blood flow and oxygen
- Obesity: Poor circulation, increased infection risk
- Stress: Impairs immune function
- Repeated trauma: Constant irritation to wound
- Foreign bodies: Debris in wound
Warning Signs: When to Seek Medical Care
See a doctor if your wound has:
- Increasing pain, redness, or swelling after the first few days
- Pus, yellow or green discharge
- Bad smell
- Red streaks spreading from the wound
- Fever or chills
- Edges pulling apart
- No improvement after 2 weeks
- Numbness around the wound
- Black or dark tissue
Could It Be Skin Cancer?
A sore that won't heal—especially on sun-exposed skin—can sometimes be skin cancer. This is particularly concerning if:
- No known injury caused the sore
- Located on face, ears, hands, or other sun-exposed areas
- Has been present for more than 4 weeks
- Bleeds easily or repeatedly
- Keeps crusting over but doesn't heal
Learn more about non-healing sores and skin cancer.
How to Promote Wound Healing
Proper Wound Care
- Keep it clean: Gentle washing with mild soap and water
- Keep it moist: Petroleum jelly or appropriate dressing
- Keep it covered: Protects from bacteria and trauma
- Change dressings: Regularly, or when wet or dirty
- Don't pick scabs: Let them fall off naturally
Support Your Body's Healing
- Eat protein: Meat, fish, eggs, legumes, dairy
- Get enough vitamins: C (citrus, peppers), A, zinc
- Stay hydrated: Drink plenty of water
- Don't smoke: Significantly impairs healing
- Control blood sugar: If diabetic
- Get adequate sleep: Body repairs during rest
Types of Chronic Wounds
- Diabetic foot ulcers: On feet, often from pressure points
- Venous leg ulcers: Usually lower leg, from poor circulation
- Pressure ulcers (bedsores): From prolonged pressure on skin
- Arterial ulcers: From inadequate blood supply
When Medical Treatment Is Needed
- Debridement: Removing dead tissue
- Antibiotics: For infected wounds
- Special dressings: Promote moist healing environment
- Compression therapy: For venous ulcers
- Skin grafts: For large wounds
- Hyperbaric oxygen: For certain chronic wounds
- Negative pressure therapy: Wound VAC