Cara how is your son? Did he start school today? Sara’s suggestions are great -and remember Vitamin C in high doses during acute illness is always a great tool. Ningxia and detox baths with baking soda and epsom salt, manuka honey (tasty so usually kids will take it on a spoon no problem) and bone broth!

That sounds more like an allergic reaction then sun poisoning. Usually sun poisoning comes along with things like fever and nausea, and liquid filled pustules. Check out this course for some targeted ideas of what to do prior to sun exposure to help alleviate this reaction. https://tribe.thewarriorcenter.com/lessons/what-to-pack/