Welcome to healthcare magic forum
Thank you for your query.
I understand your concern regarding sun burn.
it look like you have severe sun burn.
you need to take anti inflammatory medicine for it.
in severe case oral steroid
can be given.
you should apply mild steroid cream on affected area ,on swelling apply antibiotic cream.
it is gradually subside,good sign.
it is better to consult dermatologist
if problem persist.
do not wash your skin frequently as it will make your skin more sensitive.
use good sunscreen 20 minutes before going outside.
I hope I answered your question