(1) Ulcerations: Ulcerations without a history of trauma (common in BCC).

(2) White Clues:

• White lines or strands (any type) OR;
• White Circles (but not white dots or clods) OR;
• White structureless area OR;
• Clues to keratin production (i.e. scaling)

(3) Blood Vessel STRUCTURE: Monomorphous vs. Polymorphous