An 8-year-old girl presents with a painful rash, oral and genital ulcers, and a cough. Explore the Differential Diagnosis and the key next step in management.
An 8-year-old girl was brought to the dermatology clinic with a 3-day history of painful lip crusting, oral ulcers, rash, and genital pain. Ten days before presentation, a fever and cough had developed. She had no history of medication use. Physical examination was notable for conjunctivitis in both eyes and ulcers in the oropharynx. There were scattered vesicular lesions across her face, and her swollen, bleeding, exudative lips made it difficult for her to open her mouth (left). Targetoid lesions with vesicles were scattered across her arms and legs (right), and multiple small ulcers were found in the vulvar and perianal regions. Rales were present in both lung bases. Imaging of the chest showed infiltrates in both lungs. What is the most appropriate next step?
What is the most likely diagnosis?
Mucositis, Mycoplasma pneumoniae, Mycoplasma-induced rash and mucositis, Stevens-Johnson Syndrome, Testing for bacterial and viral respiratory pathogens
