This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Pediatric dermatology, Subject name: Dental
[{'content': 'Which of the following may NOT resolve spontaneously? \nSelect and explain. \nA. Erythema toxicum, B. Powine stain, C. Capillary hemangioma, D. Cephalhematoma', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Powine stain: Defect of dermal capillaries. Represent progressive ectasia of the superficial venous plexus. Lesions grow darker with age as the vessels become more ectatic. Face is commonly involved. They do not resolve spontaneously. Treatment: 585-nm pulsed dye LASER. Capillary haemangioma (strawberry marks/ angioma) undergo gradual and complete resolution. Erythema toxicum regresses spontaneously in a few days. Cephalhematoma resolves within 6 weeks.', 'role': 'assistant'}]