You may need to reconsult your doctor. Here's a splinting manual that may be helpful.
https://theiwrc.org/wp-content/uploads/2011/05/Duerr_Splinting_Manual_2010.pdf
He is handsome!
Can you get some clearer photos of the side of the leg/foot and those black areas?
Are the dark spots on both legs?
How old is he?
No other lumps, bumps (bumpy skin), lesions, tumors, etc., on the body, under the wings, neck, etc.?