Ulcer

• Circumscribed loss of the epidermis and at least the upper dermis.
• Ulcers are further classified by depth, border/shape, edge, and tissue at base.

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  An oval ulcer in Behçet syndrome.

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  Close-up of a large, granulating ulcer with a pink and violaceous border on the lateral ankle.

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  Ulcer of deep stage IV pressure injury in the sacral region.

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  Large ulcer in pyoderma gangrenosum.