Thank you for your query.
I can understand your dilemma on the problem described by you. It shall not be possible for me to give any advice without seeing the "red bumps" being described by you. Had you uploaded a photogrpah of the "bumps" it would have been better.
I can only recommend that you show your child to a doctor who shall be able to guide you once he sees the lesions. It they are insect bites
then there should be a mark of the bite in the centre of a red area.
I hope I have responded to your query to your satisfaction. Please feel free to revert back for any clarifications or if you would like to share more information.
Wishing your child all the best....