My Dear Welcome to Healthcaremagic! I have noted the contents of your post and my observations based on successful treatment for similar patients are 1 He needs to be protected from further sun exposure 2 A cream containing Fluticasone and mupirocin would work best in sucha case. 3 Additional use of oral anti allergic like Cetirizine would help control itching 4 Any OTC analgesic like ibuprofen will help pain in such a condition. 5 Once he is alright, please do apply sunscreen regularly and make sure that sunscreen is of adequate SPF and is applied in the recommended manner since children themselves cannot be expected to follow precautions like adults. I am sure this advice helps him and your anxiety is resolved.