Problem
A 35-year-old woman presents to the walk-in clinic with an erythemic rash along her left lateral rib area, somewhat under her breast, which she describes as "very painful." You note it has a few vesicles developing. The woman has a 6-month-old infant who is breastfeeding and three other children over 3 years of age, all of whom the parents have chosen not to vaccinate against common childhood illnesses. The woman describes recent stress related to providing 24-hour care in her home to her mother, who is seriously ill. The woman is seeking treatment for the painful rash.