How old is he?
What caused the wound?
Is that a discharge from the wound-any odors coming from the wound?
Can you house him without the tether for a while - this may help in the healing process.
It looks like he may have Scaly Leg Mites in addition to the wound, so you may want to treat for those as well.
You can soak both legs in a warm epsom salts bath. Gently clean the scales of both legs and feet with a soft brush. Dry the legs/feet. Apply some vaseline, coconut oil or A+D ointment to the scales to help smother the mites. Apply the oils every day for at least a week, then every other day for another week. Follow up treatment may be needed, so just repeat the steps.
For the wound, gently clean it. Stop using the Peroxide. You can use warm soapy water, Saline, Chlorhexidine (Novalsan) or Betadine to clean/flush the wound - you may need to gently scrub the wound to debride it. Apply Vetericyn or triple antibiotic ointment.
Keep us posted on his progress.