<p>A young lady was referred with a slow growing lesion on the abdomen. There was no other skin history. On examination there was an asymmetrical, multicoloured (white, brown-black, pink) macule with a small palpable component. What is the likely diagnosis?</p>
<p>Dermoscopically there is obvious <strong>asymmetry</strong> with <strong>grey structures</strong> (black arrows), an <strong>eccentric structureless white area</strong> (purple arrow), and an <strong>atypical network</strong> (blue arrow). </p><p>Histology revealed predominantly a melanoma in situ, with a suggestion of a small invasive component.</p><p>Clinically 3 or more colours / shades of colour should give cause for concern. Dermoscopically, as you can see in the algorithm, asymmetry plus any one of the aforementioned dermoscopic features should be treated with suspicion. </p>