The child has localised erythema may be due to bacterial infection. Need eloborate history like how long, if there is fever, child cries on touching the rash , is it itchy or not, is the child taking food, fluids etc voiding urine well?
For bacterial infection, you can give syrup Amoxicillin-clav 228mg/5ml. It can be given 5ml twice daily for 5 days.
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Health Tips
The dry syrup once mixed with water must be kept in refrigerator