My iguana's skin is turning dark green/black. What does it mean?

The black spots look like skin that did not shed properly. I suggest you check the cage temperature and lighting as that is the number one reason they get lethargic. Also make sure her diet is correct and you are giving her calcium supplements. ( http://www.reptilesmagazine.com/Care-Sheets/Lizards/Green-Iguana/ )

Thanks for reaching out about Capone and including a photo. Since all the discoloration on the dorsal aspect of the back and limbs, would expect an exposure concern. Could it be too hot and getting too close to the heat lamp? Ultraviolet radiation intensity would be another concern. Hormone changes usually affect the skin color over the entire body. Check husbandry parameters. If the condition persists, a veterinary visit is recommended to rule in/off bacterial or fungal dermatitis, exposure, etc. Good luck.

Without an image or physical exam, it can be difficult to determine exactly what is going on. It could be a bacterial or fungal infection, skin from shedding or trauma (burn, abrasion, etc). Ideally, Iggy should be examined by your veterinarian or a vet experienced in treating reptiles. You can find one using the link below if necessary. http://arav.site-ym.com/search/custom.asp?id=3661 In the meantime, confirm proper environmental parameters. To much humidity can promote bacterial or fungal overgrowth, too little humidity can lead to difficult sheds. Make sure Iggy cannot come into contact with either the heat lamp or UVB light source. Minor infection can be treated with daily cleanings using diluted Betadine or Chlorhexidine. Clean and sanitize the cage and use plain paper towels as substrate to make cleaning easier until the issue is resolved.

Yes, your Iguana is probably sick but these symptoms are very general and i couldn't tell you what is causing this, you will need to take him to an exotic vet specialist ASAP in order to get him checked.

It could be a hard shed or local infection (bacterial or fungal). Soak or mist him with warm water. Cleanse the area with diluted betadine or chlorhexidine solution daily. If the spot doesn't resolve or spreads, have him examined by your veterinarian or an experienced herp vet.

I'm sorry Poseidon is having some problems with his scales. The blackening may be caused by a fungal or bacterial infection. This typically requires changes to the husbandry along with a topical antibiotic or anti-fungal. It is best to have him seen by an exotic vet who can prescribe the appropriate medication. We cannot determine whether or not his normal scaling will return. Scarring will prevent the scales from coming back normally so it is best to address this issue before it worsens.

The brown spots could be early mouth rot or other infection. He should be examined by your veterinarian or a vet experienced in treating reptiles today. Check the temps in the tank. Low temps can affect appetite and activity in reptiles. His symptoms may also indicate nutritional deficiency. If he is cold, soak him in a warm 50/50 solution of water and unflavored PediaLyte. Offer an appropriate diet of fresh chopped greens. Supplement with a calcium and multivitamin powder as well. He should be under a heat lamp and a UVB light source. A special diet such as Oxbow Emeraid may be indicated. You can purchase this from your veterinarian after an exam.