If a four-month-old baby has ringworm on the face, on the one hand, you can observe whether there is any aggravation; on the other hand, you can visit a pediatric dermatologist. If the smear examination confirms that it is due to a fungal skin infection, you can follow the doctor’s advice and promptly administer antifungal treatment, such as applying some antifungal ointment to the skin surface, such as trimethoprim cream, which is safer and causes little irritation to the skin. You can also use ethoxybenzamide ointment at the same time, this drug belongs to the non-steroidal anti-inflammatory drugs, for the elimination of local inflammation has a better effect. Pay attention to the cleanliness of your baby’s skin during the treatment period, you can wash the skin with medicated soap every day. If the baby is being breastfed, you should also pay attention to the mother’s eating habits and try not to eat spicy and irritating foods to avoid affecting the baby.