Round or irregular deeper defect extending through dermis to subcutis, fascia or bone.
Color: red, often pale yellow, yellow or gray-yellow.
Peripheral erythema, sometimes necrosis.
Depends on etiology, skin and mucosal membranes.
May develop crusts or necrosis.
Always heals with scar.
Comment / Explanation
Nosologic entity, like venous ulcer.
Aphthae on mucous membranes (mm or cm).
Ulcus cruris, peripheral occlusive disease, burn, decubital ulcer, ulcerating tumours.
Vascular obstruction: reduced perfusion, infection, tumor.
Tissue destruction through trauma, burns or frost bites.