Not all mites are found on the exposed skin of your reptile pet. Some species get into the nostrils, others get into the trachea and lungs. This is a job for your veterinarian. Others lodge themselves near the sometimes moist area near the cloaca and around the base of the tail. This you can clear up by drying and disinfecting the cage.
Occasionally a recently imported iguana is found which is free of mites and ticks but is still wasting away, although eating well. This animal may be suffering from pin worms or other internal parasitic worms. His cloaca will be loaded with them and your veterinarian will be able to find them in the feces in the same way he examines dogs and cats. He may be able to treat your pet successfully. The problem is usually that the pet owner doesn’t recognize that there is a problem until the specimen is on the threshold of death.
If you wish to avoid problems like this, start with a bright eyed healthy animal and keep him clean and isolated from other animals which may be infested with parasites.
Your pet may not wear down his toenails as fast as they continue to grow. If you notice that they are twisting under or corkscrewing, you might do well to prune them a little. Go at it slowly until you find how far to clip without striking living tissue – the part of the nail nearest the toe is actually alive and is supplied with veins, arteries and nerves.
You should use a tool which cuts the nail but does not splinter it by crushing. For a young iguana, perhaps an ordinary fingernail clipper will suffice. Larger lizards will need the tool which is used for dogs. Perhaps you can buy one in your pet shop. You should not ever strike the “quick,” but if you do, you can stop the flow of blood with a styptic pencil – this is just alum and is available in your drugstore or from nearly any man who shaves with a razor. As with any minor wound, it can be treated with an antiseptic cream, but it will probably heal uneventfully regardless of whether you treat it or not.