O/E: The dermatosis extends from the posterior right shoulder to the right upper arm and consists of confluent barely elevated hypopigmented papules in a linear distribution.
Lab and Biopsy: These will be non-contributory.
Diagnosis: Lichen striatus vs. Blaschkitis
Questions: Can one differentiate between L.s. and Blaschlitis? Is any treatment indicated for an asymptomatic child who is not bothered by the eruption?