An overview on how edge of an ulcer appears with characteristic identification features depending on the underlying causes: (SPURE)
Sloping edge - Venous ulcer, also seen in traumatic cases. It is red - purplish in color and consists of new healing epithelium. ( spreading type )
Punched out edge - Arterial and Neuropathic ulcer. Edges are punched out at right angles. ( non spreading type )
Undermined edge - Decubitus and Tuberculous ulcer. It spreads rapidly to destroy the surrounding tissue !!
Rolling back - Basal cell Ca. It is characterised by raised, pearly white beaded edge with central necrotic tissue.
Everted edge - Squamous cell Ca. It is a rapidly growing invasive ulcer with heaped up and everted edges.
Hope this helps :)
- Jaskunwar Singh