Suggest Remedy For Black Spots On Skin From Insect Bites

When any insect bit my baby many black spot arrases and it become hard . due to irritation infection takes place. My local doctor says that his Eosinophil count is high. He gave me the Ointment MOMET – F. The Age of my Baby is 20 Months. Weight is 11 K.g. Please Suggest what is the problem and how can I cure it.