AGMINATE AND PLAQUE-TYPE BLUE NEVUS COMBINED WITH LENTIGO, ASSOCIATEDWITH FOLLICULAR CYST AND ECCRINE CHANGES - A VARIANT OF SPECKLED LENTIGINOUS NEVUS

Agminate and plaque-type blue nevi are rarely described. We report the occurrence of such a type of blue nevus associated with eccrine chan ges and a follicular cyst all arising on a macular brown background in a 38-year-old man. The patient presented numerous blue papules and a plaque, overlapping a light tan patch present since birth, on his left thigh. In addition, within the plaque, 3 papules, discharging at inte rvals a serous fluid, were present. Since the lesion hardened and enla rged, it was surgically excised. Histologic findings revealed a lentig o pattern of the epidermis, corresponding to the light tan macular bac kground and a plaque-type blue nevus, and areas of eccrine ductal prol iferations with a ruptured follicular cyst. The association of agminat e and plaque type blue nevus, arising on a light brown patch of lentig o, might represent a variant of speckled lentiginous nevus. Eccrine pr oliferations may be reactive in nature or represent a more complex ham artomatous lesion. The possibility of malignant transformation and the recent enlargement of the lesion caused by the ruptured follicular cy st convinced us to carry out a wide surgical excision.