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He had a similar lesion on his thigh a few months ago

A 62-year-old male presents with this severely pruritic cutaneous eruption. Two weeks ago, the top of a tractor fell on his back so he thought this was a reaction to the trauma. Do you recognize this?

“An extremely rare mutation”

A 38-year-old male presents with a 20-year history of nail dystrophy. He is noted to have absent dermatoglyphics on some fingers and toes, and the second digit on his left hand also has a koilonychial appearance. See the diagnosis>>

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This was originally published in the August 15, 2019 edition of our Differential for Dermatology newsletter. The Differential is our premium newsletter which includes clinical cases and updates you’ll find useful based on your specialty. To sign up, download the Figure 1 app and update your email preferences.