thanks to all that replied. I was able to find a local reptile vet who determined that the calcium supplement I was using was indigestable. He perscribed a liquid calcium supplement and after a few days of treatment Nacho (my iguanas name is Nacho) is looking and acting much better. The swelling apears to be subsiding and hes eating and as active as ever. I added an extra light for good measure and I expect a full recovery. I appreciate the info.
Thanks again,
Jason