thanks for posting your query.
You have got radiation
burns due to repetitive radiotherapy. First degree radiation burn may simply go away after a couple of days, without even treatment. Second degree burns may show blisters and are more painful, may take a month to heal. Make sure your skin is not blacken and charred, which can be a sign of higher degree.
Usually over the counter pain killer, burn ointments
and antibiotics are used. You can use ibuprofen
for pain and use burn ointment Topicure.
If burning sensation persist then visit your doctor.
Hope it helps.