Davener’s dermatosis is a variant of frictionhypermelanosis first described by Naimer et al. in 2000. Davener’s dermatosis is characterized by an elongated, vertical, midline, hyperpigmented patch with indistinct borders, which was distributed along the skin overlying bony protuberances of inferior thoracic and lumbar vertebrae. Repeated rubbing of the lower back against a rigid backrest in subjects with a lean body type was considered to induce changes that promote hyperpigmentation. A 30-year-old male presented several ill-defined, elongated, vertical, hyperpigmented dark brownish patches on the back. He had a 2-year history of skin lesions on the lower back which spread gradually. He did not have any medication history nor underlying disorders. Biopsy specimen from the hyperpigmented patch showed diffuse hyperkeratosis, acanthosis, elongation and fusion of rete ridges, and marked basal hyperpigmentation in epidermis. Thus we diagnosed Davener’s dermatosis and treated with Q-switched neodymium: yttrium- aluminum-garnet laser. Davener’s dermatosis has been reported rarely and only one case was reported previously in Korea. Also, reports on treatment of the disease are sparse. Herein, we reportan uncommon case of Davener’s dermatosis.