Fourteen patients had solitary or multiple nodular lesions located within the dermis, and frequently the subcutis as well. The patients were mainly young females, with tumors ranging from 0.2 to 4 cm in diameter, localized mainly to the head. Histologically, the tumors showed the unusual combination of poorly differentiated proliferating vessels, tissue eosinophilia, and, at times, lymphoid follicle formation or arteritis or both. The lesions were apparently benign and can uaually be cured by excision. The term "angiolymphoid hyperplasia with eosinophilia" (ALH) describes the essential histopathologic features.
Mehregan AH, Shapiro L. Angiolymphoid Hyperplasia With Eosinophilia. Arch Dermatol. 1971;103(1):50-57. doi:10.1001/archderm.1971.04000130052007