Go pick up betadine solution (not a creme but a liquid) and antibiotic ointment without pain relief (very important to get some without pain relief). I forget what you have in the UK but I think Brulidine?
Take some cotton swabs and apply betadine to the wounded area and let sit for 30 minutes or so. Apply with a fresh cotton swab the antibiotic ointment without pain relief to the scar. Repeat every few days. If the scar does not show signs of improvement after a few weeks, make an appointment with a vet knowledgeable in reptiles.
Why so many of you in the UK insist on heat lamps inside cages is beyond me but if it is a burn scar then most likely it is from one of those.