Thank you for your query on Healthcare Magic,
This itchy lesion may be due to a fungal infection
like a ring worm
or a folliculitis
But physcical examination of the skin lesion is important for the accurate diagnosis as the treatment vary for different skin lesions.
For temporary relief of itching you can apply calamine lotion externally over the lesion and consult your Pediatrician
for the appropriate management.
Hope I have answered your query.