Make your own diagnosis A 6-year old child with hyperpigmented patches in the right arm and chest.

A 6 year-old male patient was admitted to the dermatology department with an eruption on the right arm, chest and left leg. No clinical symptoms such as pain, pruritus or previous inflammation were present. His mother reported that the lesion had developed four years ago as small-sized hyperpigmented macules which enlarged in a short period of time as band-like hyperpigmentation, and then remained unchanged. His past medical history was unremarkable and there were no similar cases in the family.