Lichen striatus is an uncommon, self-limited skin disorder of younger children of unknown etiology. It may occur rarely in adults. Trauma, drugs, immunization, viral infections, and pregnancy have been identified as potential causes in case reports. In addition, lichen striatus is more common in patients with atopic backgrounds, such as those with a personal or family history of atopic dermatitis, asthma, or allergic rhinitis. It has been reported in children as young as 3 months. There is a female predilection. It presents with linear or curvilinear bands of slightly scaly, pinpoint, skin-colored or lichenoid papules that follow the lines of Blaschko. Lesions are usually on an extremity; however, lichen striatus can occur anywhere. It is typically asymptomatic. Lichen striatus has rarely been reported to affect the nail in the involved Blaschko line.

The nomenclature of lichen striatus in adults has remained controversial. Some authors classify acquired Blaschko dermatitis as the adult form of lichen striatus. Others view it as a separate diagnosis given its distinctive histopathology as well as the fact that typical lichen striatus cases are encountered in adults.