My friend bought 2 Iguana recently. But one of them look strange these few days. The subtympanic shield of the left side is swelling. And the skin around typanum turn white too. Check the link below for photo iguana a , iguana b

http://pets.ph.groups.yahoo.com/group/IguanaMail/photos/browse/1cd5
( Photo iguana c show the normal right hand side of the head.)

Could this be disease? If yes, what disease is this? What cause this? And how to cure?

Thanks.
Link