mechanism for the development of GD. Exacerbating factors typically include heat, exercise, sweating, and UV light. 3 Chronic renal failure, malignancy, and transplants have also been associated with GD eruptions. 1 Moreover the microscopic hallmark of GD is the presence of focal acantholysis and dyskeratosis. 2 In our reported case, physical examination was highly suggestive for acantholytic dyskeratotic dermatosis, and the histopathological examination confirmed the diagnosis, showing more than one type of histological pattern with a significant predominance of hypergranulosis. Patient's age and clinical condition with recurring episodes, associated with negative medical history and histopathological examination, led us to the correct diagnosis of Grover disease. Histologically, the concurrent presence of marked hyperkeratosis and vacuolar degeneration of the upper epidermis with dyskeratotic cells is a peculiar and unusual microscopic finding of GD. This histological evidence supports the inclusion of epidermolytic hyperkeratosis among the histopathological patterns of GD. Even if only a few cases have been described in the literature, clinicians should keep in mind this particular histological pattern for a good interpretation and treatment of GD.