Acquired isolated zosteriform collagenoma

A 10-year-old boy presented with a 4-year-old asymptomatic, skin-colored, soft, ill-defined plaque with irregular surface in a segmental pattern involving the right posterior T8-T10 dermatome region [Figure 1a].ere was no history of seizures or any similar complaints in any of the family members.Rest of the cutaneous and systemic examination was normal.Hematoxylin and eosin examination revealed thickened, irregular dermal collagen [Figure 1b].Masson-trichrome [Figure 1c] and Verhoeff-Van Gieson [Figure 1d] stains highlighted the collagen hyperplasia and reduced elastic fibers.e clinical and histological findings were conclusive of acquired isolated zosteriform collagenoma.