Transient neonatal pustular melanosis (TNPM) is an idiopathic pustular disease of term newborns. Lesions begin in utero as pustules that then rupture, leaving behind collarettes of scale and hyperpigmented macules. Depending on the eruption's stage of evolution, infants are born with some combination of pustules, scale, and hyperpigmented macules. The pustules and scale resolve within 2 weeks of birth, leaving behind hyperpigmented macules that persist for several months. New lesions do not form after delivery.