Tylenol or ibuprofen started early and continued for 2 days can reduce the discomfort and swelling.
Nonprescription 1% hydrocortisone cream applied 3 times each day may also decrease swelling and pain, but only if used early. Use a moisturizing cream until you can get the steroid cream. Avoid petroleum or other ointments because they keep heat and sweat from escaping.
Cool baths or wet compresses several times daily. Add 2 oz baking soda per tub. Avoid soap on the sunburned skin.
Offer extra fluids (water or other fluids) on the first day to replace the fluids lost into the sunburn and to prevent dehydration and dizziness.
Trim skin of broken blisters to prevent infection
Apply non prescription antibiotic ointment for any open blisters. Remove it with warm water and reapply it twice daily for 3 days. Call for appointment
Several blisters break open.
The sunburn looks infected.
Your child becomes worse.