This article discusses a rare condition called pigmentary lines of the newborn, which is characterized by the presence of thin hyperpigmented lines on the abdomen, back, and limbs of infants. The condition is more commonly seen in male infants with darker skin. It is a benign and transitory condition that resolves spontaneously between 2 and 8 months of age. The diagnosis is based on clinical examination, as there are no specific laboratory or histopathologic findings. Treatment is not necessary, and the condition does not have any extracutaneous associations. [Extracted from the article]