Your free Two-Step overview card

The Two-Step Algorithm on one page. Step 1 asks a single question: does the lesion show one of these benign patterns? If yes – and the specific structures support it – you can name it. If not, go to step 2 and look for melanoma clues.

How to use it

• Nevus: match the global pattern first (reticular, globular, homogeneous, starburst …), then check that the structures are regular.

• Dermatofibroma, seborrhoeic keratosis, angioma and others: look for the specific clue shown on the card.

• Nothing fits? Do not force a benign pattern – move on to step 2.

Practise it

Use the card on this week's Case of the Week before the diagnosis comes out on Friday.

Want all 15 cards?

The Two-Step Algorithm Cards 2026 (print-ready PDF, CHF 30, residents CHF 15) cover both steps, the special locations and the melanoma clues. They are included in the Dermoscopy Algorithm Masterclass, where I walk you through every card with real cases.