Systemic juvenile idiopathic arthritis rash with Koebner phenomenon

Systemic juvenile idiopathic arthritis rash on a patient's back is shown in panel A, with a close-up view in panel B. The rash usually consists of multiple round-to-oval, salmon-pink macules that are slightly raised and are of differing sizes. The rash can appear following stroking of the skin or other minor trauma (Koebner phenomenon).