Welcome to Healthcare Magic,
Your son developed allergic reaction
and lotion will not help. Right now he need injection with hydrocortisone
or methylprednisolone, plus antihistamines injection or tablets such a Benadryl, or chlorfeniramine and IV fluids. Monitor carefully and if you will note difficulty in breathing, changed voice, dizziness
then you need ASAP bring him to emergency room.
I wish you good luck and speedy recovery,
Hope this helps and I have answered your query. If you have additional queries don’t hesitate to ask.