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Table 3 The "CUBED" acronym for foot melanoma

From: Clinical guidelines for the recognition of melanoma of the foot and nail unit

C Coloured lesions where any part is not skin colour.
U Uncertain diagnosis. Any lesion that does not have a definite diagnosis
B Bleeding lesions on the foot or under the nail, whether the bleeding is direct bleeding or oozing of fluid. This includes chronic "granulation tissue".
E Enlargement or deterioration of a lesion or ulcer despite therapy
B Delay in healing of any lesion beyond 2 months.
  1. Refer when any two features apply.