A 7‐year‐old girl presented to the emergency department with fever and right forearm redness. Physical examination revealed a traumatic wound on her right fourth finger, tender erythema of the affected finger (Figure, red arrow), dorsum of the hand, and a linear red streak extending to the elbow (Figure, white arrows), with one palpable tender supratrochlear lymph node (1 × 1 cm). The range of motion of the finger was limited. Staphylococcus aureus infection was confirmed by pus culture. A clinical diagnosis of acute lymphangitis — an infection of the lymphatic vessels — was made.1,2 The patient was successfully treated with oral dicloxacillin and elevation of the forearm.