What is your humidity level?
To be quite honest, I am not sure how a skin condition can be associated with an over calcification..

Can you post a picture of his whole body? Especially, his front legs.. Somehow, I see an odd bowing on the photo (but, it could just be caused by the weird angle in your pics)
If in doubt, consult your herp vet.
If you live in South California, I would HIGHLY suggest you bring your chameleon to:
Dr Tom Greek
23687 Via Del Rio
Yorba Linda, CA 92887
714-463-1190
Or Dr Geoff Stein
Dr Shipp's Animal Hospital
351 Foothill Rd.
Beverly Hills, CA 90210
Tel: (310) 550-0101
Or find a herpvet in your state by going to this site:
http://www.herpvetconnection.com