Persistent congenital pigmented plaque

You are called to the newborn nursery to evaluate a healthy vigorous newborn with a large dark brown area on the back of the scalp and neck. The anxious first-time parents are tapping on the nursery window as you examine the child. What's the diagnosis

Annoying neck nodules in an adolescent boy

A healthy adolescent boy asks you to cure an itchy rash on the nape of his neck, which started over a year ago when he switched barbers. (fig. 1).