Grimace-inducing photos - Tradução em português

Bom dia!
Estou traduzindo um trecho do livro de Patrícia MacDonald - Cast into Doubt, mas estou com dúvida no seguinte sintagma: ...grimace-inducing photos of virulent skin conditions...

Segue a frase dentro do contexto.
. He was in medical school, and the work was grueling. He always had a textbook open under the counter. The venous systems or the lobes of the brain or grimace-inducing photos of virulent skin conditions were always peeking out from the shelf under the cash register.

Espero que alguém possa me ajudar.

Obrigada

Suzana