This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Infectious disease, Subject name: Pediatrics
[{'content': 'The diagnosis of a child with small abrasion over face developing fever with chills,induration and fiery red swelling over the face to extending to the ear? \nSelect and explain. \nA. Erysipalas, B. Carbuncle, C. Cellulitis, D. Anthrax', 'role': 'user'}, {'content': 'Answer: A \nExplanation: - Erysipelas is a bacterial infection of skin involving upper subcutaneous tissue with marked dermal lymphatic vessel involvement. - Causative organisms are group A streptococcus and staphylococcus aureus. - Characterised by an erythematous, edematous and painful indurated plaque with sharply demarcated borders. - Face, ear and lower limbs are involved. - Patient May present with history of minor trauma and is associated fever and malaise. FIGURE : Butterfly rash of erysipelas. The sharp demarcation between the salmon-red erythema and the normal surrounding skin is evident. Reference : IADVL&;s concise textbook of dermatology, first edition, pg no:43', 'role': 'assistant'}]