The Papulonecrotic Differential Diagnosis

1. PLEVA (pictured here)

2. Lymphomatoid papulosis

3. Papulonecrotic tuberculid ( a rare form of cutaneous tuberculosis)

4. Arthopod assault

This is an important picture, in that the papulonecrotic ddx should roll off your tongue just as easily as ROYGBIV.  This is one of the fundamental descriptors in dermatology.  Congrats to those who got it right!