Can be a lot of reasons.
One must post pictures of the boil.
Next Steps
Stop all medications.
Health Tips
Don't use irrelevant creams for the child. Steroidal creams can be harmful in an infection. Antibiotic creams might or might not be needed depending on the lesion. I would like to see the boils and other associated complaints, like fever, ear discharge, boils in other parts of body, urine infections, bleeding spots etc. Text me if interested.