Observations: A 15-month-old girl presented with brown-red macules and papules all over her body. The child's mother reported that the macules, which first appeared 6 months ago, became red and swollen when scratched or rubbed, and decreased in size as the child grew. Dermatologic examination of the skin revealed multiple, widespread, oval/round brown-red macules and papules on the posterior trunk and extremities except the soles, palms, and mucous membranes. The diagnosis of mastocytosis was confirmed with histopathological examination. Abstrac