Define Ulcers — Classification & Management. Describe its classification, investigations and management.

The Concept

An ulcer is a break in the continuity of the covering epithelium — of skin or of a mucous membrane. Ulcers are extremely common in surgical practice, and the whole art of managing them lies in reading the ulcer to work out its cause, because the treatment of a venous ulcer, an arterial ulcer, a diabetic ulcer and a malignant ulcer are completely different. The clinical appearance — especially the edge — is not just description for its own sake; each feature is a direct clue to the underlying pathology.

Classification

Ulcers can be described in two complementary ways. Clinically, by their current behaviour — a spreading ulcer (actively enlarging, inflamed edge), a healing ulcer (with a sloping, bluish, epithelialising edge), or a callous/chronic ulcer (long-standing, indurated, making no attempt to heal). Aetiologically, by cause — venous, arterial (ischaemic), neuropathic (trophic/diabetic), pressure (decubitus), traumatic, infective (tuberculous, syphilitic), malignant (Marjolin's, squamous or basal cell carcinoma), and tropical.

Reading the Edge — the Key Skill

The edge tells you what the ulcer is doing, and therefore what is causing it:

So a punched-out ulcer on the tip of a toe with absent pulses is almost certainly ischaemic; the same punched-out ulcer on the sole of a diabetic foot, but painless and surrounded by callus, is neuropathic. The reasoning is the appeal, not rote memory.

Understanding the Common Ulcers

Venous ulcers arise from chronic venous hypertension (failing valves): the sustained high pressure damages the skin capillaries in the 'gaiter' area around the medial malleolus, producing the typical shallow, sloping-edged ulcer with surrounding pigmentation and lipodermatosclerosis. Arterial (ischaemic) ulcers come from an inadequate blood supply, so they occur at the most distal, pressure-exposed points (toes, heel), are painful and punched-out, with absent pulses. Neuropathic (diabetic) ulcers result from loss of protective sensation — the patient does not feel repeated minor trauma, so a painless, punched-out ulcer forms at pressure points on the sole, often with surrounding callus.

Marjolin's Ulcer — Never Forget It

Marjolin's ulcer is a squamous cell carcinoma arising in a chronic wound, scar or sinus — classically in an old burn scar or a long-standing ulcer. Because it grows in scar tissue that has no nerves and few lymphatics, it is characteristically painless and slow to metastasise, and its edge becomes everted. This is the single most important reason why the edge of any chronic, non-healing ulcer must be biopsied — to catch malignant change before it is missed.

Investigations

A wound swab identifies infecting organisms, but the crucial test in a chronic ulcer is biopsy of the edge to exclude malignancy. Vascular ulcers need assessment of the arterial supply with Doppler and the ankle-brachial pressure index (ABI) — this must be done before applying compression, since compressing an ischaemic limb is dangerous. Blood glucose is checked for diabetes, and X-ray looks for underlying osteomyelitis.

Management

The overriding principle is to treat the cause, alongside good local wound care — debridement of slough, appropriate dressings and control of infection. The cause-specific treatments follow directly from the pathology: compression therapy for venous ulcers (to reverse venous hypertension), revascularisation for arterial ulcers (to restore blood supply), and offloading plus tight glucose control and infection management for diabetic foot ulcers, with pressure relief and nursing care for decubitus ulcers. Once a clean, healthy granulating bed is achieved, a skin graft or flap may be used to close a large defect, supported by good nutrition.

How to Examine an Ulcer

A methodical examination is what generates the clues above. On inspection, note the site (e.g. Gaiter area suggests venous, toe tip suggests arterial, sole suggests neuropathic), size, shape, number, the all-important edge, the floor (its tissue — healthy pink granulation, or slough, or malignant tissue), and the discharge. On palpation, assess the base for induration (a hard base suggests malignancy or chronic fibrosis), tenderness, and fixity to deeper structures, and — crucially — examine the regional lymph nodes and the vascular and neurological status of the limb, since these determine both cause and management.

Pressure (decubitus) Ulcer

A pressure ulcer forms over a bony prominence (sacrum, heel, ischial tuberosity, greater trochanter) in an immobile, bedridden or unconscious patient. Sustained pressure exceeds the capillary filling pressure, cutting off the blood supply to the skin and causing ischaemic necrosis. The lesson is that prevention — regular repositioning, pressure-relieving mattresses, good nutrition and meticulous skin care — is far easier and more effective than treating an established ulcer.

Principles of Management (summary)

Identify and treat the underlying cause → Optimise host factors — nutrition, glucose, tissue perfusion → Local wound care — debride slough, dress, control infection → Biopsy the edge of any chronic ulcer to exclude malignancy → Definitive cover (skin graft/flap) once a healthy granulating bed is achieved

The edge of the ulcer usually reveals its underlying nature.

• Ulcer = break in covering epithelium; the skill is reading the ulcer to find the cause.
• Classify clinically (spreading/healing/callous) and by cause (venous, arterial, neuropathic, pressure, infective, malignant).
• Edge clues: sloping (healing/venous), punched-out (ischaemic/trophic/syphilitic), undermined (TB), everted (SCC), pearly (BCC).
• Marjolin's = SCC in a chronic scar/ulcer — painless, slow to spread; always biopsy the edge of a chronic ulcer.
• Assess vascular status (ABI before compression) and glucose; treat the cause — compression (venous), revascularisation (arterial), offloading (diabetic) — plus wound care.