Thanks for writing to us.Sunburn
can present with redness, pain, sweloing and blisters.
To treat the same
Do cold compresses of the area
Apply steroid antibiotic cream over affected area
Continue aloe vera
Take oral antiinflammatory analgesic
to redude pain and swelling
Avoid sun exposure strictly.
If the lesions do not heal in few days or swelling persists, you might need a course of oral steroids
Hope that helped.