The largest study to date examined 197 cases of<unk> . In this study, most individuals presented with a slowly growing, symptomless, subcutaneous mass although rarely these masses were rapidly growing, and/or were tender, painful, warm, and/or were accompanied by skin changes, pigmentation, sweat gland enlargement, and/or increased hair overlaying the tumor. Sixty-eight percent of these cases were diagnosed in the first year of life, 23% were diagnoses at birth, and 9% were diagnosed in children 2-5 years old. The male-to female ratio was 2.4. The tumors were most common in the axilla (23% of cases), upper arm (12.5%), lower arm (10.5%), external genitalia area (9.5%), and inguinal region (7.5%); less common or rare sites for these tumors were the buttocks, back of the head, back of the neck, back of the torso, lower arm, leg, foot, chest, and anal area. Most cases presented as solitary masses but 3 cases presenting with 2 tumors and 1 case presenting with 5 tumors. Overall, the size of these tumors varied between 0.5 to 4.0 cm but in rare cases were as large as 20 cm. Two subsequent studies of 145 and 60 individuals agreed with all of these results but also did diagnose<unk>  in individuals as old as 8 and 14 years, respectively.
Fibrous hamartoma of infancy
Tuber cinereum hamartoma
Neuroma cutis
Benign neonatal hemangiomatosis
Eccrine angiomatous hamartoma
Neural fibrolipoma
Infantile hemangiopericytoma
Ganglion cyst