Summary

Shiitake-induced flagellate dermatitis is a rare cutaneous reaction characterized by linear erythematous lesions arranged in a flagellate pattern, typically occurring after the ingestion of inadequately cooked shiitake mushrooms.

We report the case of a 56-year-old male patient with no significant medical history who presented with an intensely pruritic eruption that developed 24–48 hours after consuming undercooked shiitake mushrooms. Clinical examination revealed linear erythematous lesions distributed over the trunk and limbs.

The diagnosis was established based on the characteristic clinical presentation and relevant dietary history, without the need for additional investigations. The patient showed complete resolution following symptomatic treatment.

Recognition of this entity is essential, as it allows for prompt diagnosis and prevents unnecessary investigations.