Well, a couple of things... First, from what I have heard, getting him "fixed" is no guarantee that breeding season aggression will go away. Second, start to watch and learn Freddie's behaviors and learn something from this incident. Male Iguanas in breeding season can be very unpredictable (but do give some warning signs - watch his eyes)) and downright dangerous. Freddy doesn't appear to be that big, so fortunately this bite only resulted in a welt and a little blood. A full grown adult can easily bite THROUGH a cheek or require many more stitches than anyone wants in their face! I'm not trying to be morbid here, but caution is a good thing, and may avoid much suffering down the road...
Along those same lines... I would also recommend weaning your iguana off of climbing on your head as soon as possible. Yeah, it's cute now, but he is going to get bigger, and believe me, you don't want a 8, 10 or 15 lb. iguana thinking that its a good idea to be up there. They don't have much (any) respect for your face, and can do quite a bit of damage to a lip, eye or ear very quickly. I've gotten my lip cut from the inside by a toe on my iguana's rear leg from him climbing up my chest and around my shoulders, behind my head! During breeding season, my iguana is allowed nowhere near my face. His first season, he bit the back of my head, and now I know better. He can be very aggressive during this time, so when I handle him, his face is always pointed away from me! Hopefully you iguana won't give you such problems, but be aware that they can exist.
>>I can laugh because the same thing happened to my husband and I but it was him that got bit and not me. (Mwhahahaha!) Freddie was perched on my shoulder and Jake moved in to give me a hug when all of a sudden..... Freddie bit his face!!! Not too bad but he managed to get ahold of his cheek and neck and Jake had a pretty big welt and a little blood from that one. I think someone has a crush on me. *snickers*
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>>He is so getting fixed next year! No 'guana is gonna tell me whether I can or cannot get lovin' from my man!