Leg ulcer - venous
Exam Tips
- In OSCEs, always document ulcer site, size, depth, edge, bed tissue, exudate, pain, surrounding skin, and pulses in both legs.
- State ABPI before compression: this is the key safety checkpoint for excluding significant arterial insufficiency.
- Typical venous pattern: gaiter-area, shallow irregular ulcer + oedema + hemosiderin/eczema/lipodermatosclerosis; arterial clues are punched-out edge, cold limb, and reduced pulses.
- Do not swab every ulcer: reserve microbiology for clinical infection (increasing pain, cellulitis, malodour, purulent exudate, systemic features).
- If edge is rolled/everted or ulcer fails to improve despite optimal care, escalate for biopsy to exclude malignancy.
- Mention recurrence prevention in viva answers: long-term compression hosiery, calf-muscle activation, and risk-factor optimisation.
Definition
A venous leg ulcer is a chronic full-thickness skin defect below the knee that has failed to heal after at least 2 weeks, occurring in the context of venous disease. It is the commonest leg-ulcer subtype in UK practice (about 60-80%) and classically affects the gaiter region between ankle and mid-calf.
Pathophysiology
The core mechanism is sustained ambulatory venous hypertension from chronic venous insufficiency. In a healthy limb, calf-muscle contraction lowers venous pressure and competent perforator/deep venous valves prevent reflux; in venous disease, valve incompetence, prior DVT damage, or reduced ankle/calf pump function causes persistent reflux and pressure transmission to the microcirculation. This drives capillary leak, oedema, leukocyte trapping, fibrin cuff formation, inflammatory cytokine release, and tissue hypoxia, producing venous skin changes (haemosiderin pigmentation, eczema, lipodermatosclerosis, atrophie blanche) and progressive skin fragility until ulceration occurs. Delayed healing is worsened by comorbidity (arterial disease, diabetes, malnutrition, anaemia, immobility) and repeated inflammation/infection cycles.
Risk Factors
- Increasing age
- Previous venous leg ulcer
- Obesity
- Immobility or sedentary lifestyle
- Reduced ankle range of movement (impaired calf pump)
- History of DVT
- Varicose veins (personal or family history)
- Female sex
- Pregnancy (risk rises with parity)
- Prolonged standing
- Previous leg trauma or fracture
- Arteriovenous fistula
- Lower socioeconomic status (linked to slower healing and higher recurrence)
Clinical Features
Symptoms
- Chronic ulcer with slow healing, usually in gaiter area
- Leg aching/heaviness and swelling, often worse later in the day
- Itching around the lower leg (often with venous eczema)
- Pain that may improve with elevation (unlike pure arterial ischaemic pain)
- Exudate, malodour, or increasing pain if secondary infection develops
Signs
- Ulcer in gaiter region (commonly medial lower leg)
- Shallow ulcer with irregular, gently sloping edge
- Granulation tissue and variable slough; exudative wound bed
- Pitting oedema
- Venous skin changes: hyperpigmentation, venous eczema, lipodermatosclerosis, atrophie blanche
- Varicose veins
- Features arguing against simple venous ulcer: punched-out, rolled, or everted edge; cold/pale foot, reduced pulses, delayed capillary refill
Investigations
Management
Lifestyle Modifications
- Graduated compression therapy after arterial disease is excluded (ABPI-guided), with leg elevation to reduce oedema
- Daily walking and ankle mobility/calf-pump exercises
- Weight reduction where appropriate and smoking cessation support
- Structured skin care: regular emollients, protect periwound skin, avoid sensitising topical products
- Optimise nutrition/hydration and treat comorbidity (heart failure, CKD, diabetes, rheumatoid disease)
- Long-term recurrence prevention: continued compression hosiery once healed and prompt review of new skin breakdown
Pharmacological Treatment
Analgesia
- Paracetamol 1 g orally every 4-6 hours when required (maximum 4 g/day)
First-line pain control. Avoid exceeding total daily dose; reduce maximum dose in low body weight, severe liver disease, or chronic alcohol excess.
Systemic antibiotics (only for clinically infected ulcer/cellulitis)
- Flucloxacillin 500 mg to 1 g orally four times daily for 5-7 days (extend if slow response)
- If penicillin allergy: Clarithromycin 500 mg orally twice daily for 5-7 days
- If penicillin allergy and macrolide unsuitable: Doxycycline 200 mg orally on day 1, then 100 mg once daily (typically 5-7 days total)
Do not prescribe antibiotics for uninfected ulcers. Check allergy history, renal/hepatic function, QT-risk and drug interactions (notably clarithromycin), and pregnancy cautions (avoid doxycycline in pregnancy). Escalate urgently for systemic toxicity, rapidly spreading infection, suspected osteomyelitis, or sepsis.
Topical anti-inflammatory treatment for surrounding venous eczema (not ulcer bed)
- Hydrocortisone 1% cream/ointment thinly once or twice daily for short course
- Betamethasone valerate 0.025-0.1% once or twice daily for more severe eczema, short intermittent course
Apply to inflamed peri-ulcer skin only, not routinely inside ulcer cavity. Use lowest effective potency/duration to reduce skin atrophy risk; review for allergic contact dermatitis if eczema persists.
Emollients/barrier preparations
- Regular leave-on emollient (for example simple paraffin-based or urea-containing emollient) at least twice daily
- Barrier film/ointment to protect peri-wound skin from exudate maceration
Choose products with low sensitisation potential; avoid known allergens (for example lanolin/latex in susceptible patients). Warn about fire risk with paraffin-containing emollients on dressings/clothing.
Surgical / Interventional
- Endovenous ablation of superficial venous reflux (thermal laser/radiofrequency) once ulcer pathway assessment confirms suitability
- Ultrasound-guided foam sclerotherapy for selected superficial venous incompetence
- Surgical ligation/stripping or perforator intervention in selected recurrent/refractory disease
- Debridement when non-viable tissue is impeding healing
- Skin grafting or advanced wound procedures for large/refractory ulcers under specialist care
Complications
- Chronic pain
- Reduced mobility and functional decline
- Recurrent cellulitis and soft tissue infection
- Deep infection including osteomyelitis and possible bacteraemia/sepsis
- Allergic contact dermatitis from dressings/topicals (for example preservatives, lanolin, latex, topical antibiotics/steroids)
- Hypergranulation and persistent exudate
- Sinus/fistula formation (uncommon)
- Malignant transformation in chronic ulcer (Marjolin-type change, usually SCC)
- Psychological distress, social isolation, and loss of independence
Prognosis
Healing and recurrence are variable. In UK data, around half of venous ulcers heal within 12 months (often average healing around 3 months in those that heal), with better outcomes in specialist services than routine community care; recurrence is common (roughly one-quarter to two-thirds within a year in published cohorts). Poorer prognosis is linked to ulcer duration >1 year, larger ulcer area, ABPI <0.8 (mixed arterial disease), impaired calf pump/ankle immobility, heavy fibrin burden, lower socioeconomic status, and poor adherence to compression/preventive care.
Sources & References
✅NICE Guidelines(1)
- Leg ulcer - venous[overview]
📖Textbook References(4)
- David Randall PhD MRCP (Editor), John Booth PhD MRCP (Editor), K - Kumar and Clark's Clinical Medicine (2025, American Elsevier Publishing Co.) - libgen.li.pdf(pp. 1666, 1667)[context]
- David Randall PhD MRCP (Editor), John Booth PhD MRCP (Editor), K - Kumar and Clark's Clinical Medicine (2025, American Elsevier Publishing Co.) - libgen.li.pdf(pp. 1667)[context]
- David Randall PhD MRCP (Editor), John Booth PhD MRCP (Editor), K - Kumar and Clark's Clinical Medicine (2025, American Elsevier Publishing Co.) - libgen.li.pdf(pp. 1667)[context]
- David Randall PhD MRCP (Editor), John Booth PhD MRCP (Editor), K - Kumar and Clark's Clinical Medicine (2025, American Elsevier Publishing Co.) - libgen.li.pdf(pp. 1665, 1666)[context]