Can you tell me about the set up you have for the turtles?
Do you have UVB lighting?
Do you have a basking light?
Do the turtles get any supplements?
What type of diet are they on?
Could you please tell me more about the leg? Is the wound deep? Is the area swollen? Is he just biting at the one area?
Any further information will be greatly appreciated so I can give you the best service.
The picture did not post, but I will give you some information based on what you have given me.
The Regular lights bulbs do not supply UVB. The UVB is a specialized bulb that emits UVB rays to help metabolize calcium in the body. Without a UVB bulb, the turtle is left open for Metabolic Bone Disease. This can manifest itself in the form of swollen joints, weakened immun system, softening of the shell, jaw problems and other issues. The UVB bulb should be a min of a Reptisun 8.0 and the turtle also needs calcium to work with the UVB bulb to prevent MBD. The UVB bulb looses potency after 6 months of usage. It should be run 12-14 hours a day to supply the optimum UVB rays. For calcium we usually offer cuttle bones into the habitat.
What I suspect is the turtle is having pain in the area where he is biting the leg. This is very common when a turtle has pain for them to bite at the area. At this point you can clean the area with some Diluted Betadine and water and let dry. Next apply a thin layer of Neosporin to the sore.
I do suggest a Herp Vet look at the leg to see if this is something that needs pain medication, or an Antibiotic to treat the area.
This is a good care sheet for the Eastern Painted turtle: http://www.austinsturtlepage.com/Care/caresheet-eastern_painted.htm
If you need a Herp Vet, I would be happy to locate some withing your State. If you would like me to locate somefor you please supply a State.
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Glad to hear things are looking up! I hope it does not come down to having to take him into the Herp Vet, but I am concerned and hope the changes help.