My turtle has a red mark on its mouth that won't come off. Injury?

Thanks for reaching out about Sheldon and including photos. Continue to monitor the growth of the lesions. Maintain pristine water conditions. You can try a gentle scrub with a soft brittled tooth brush and chlorhexidine or dilute iodine/betadyne. If lesion continue to grow, a veterinary visit is needed. Good luck

Thanks for reaching out about June. Lesions are common on the top of the head or neck in aquatic turtles, when they pull their heads in quickly and traumatize the skin on the front edge of the carapace. These lesions can then become secondarily infected by bacteria or fungus. A veterinary visit is recommended to assess and provide a diagnostic/treatment plan. But you also need to provide June with an environment that is less startling. Tanks should not be set up in a high traffic area where people are constantly crossing. Visual blinds (newspaper, etc) can be applied to the outside of the tank to provide a sense of security. Good luck.

Thanks for reaching out about Squirtle and including photos. A probably diagnosis is an infection, requiring debridement of the wound and systemic antibiotics. A veterinary visit is recommended. Good luck.

Good photo. Thanks for providing one. It looks like his lower beak has a fracture. I wouldn't necessarily be worried but I do think you should do some treatment to keep it from getting infected. If you get some Betadine solution and dilute it to a weak, light brown color you can use a cotton tipped applicator to wipe inside the defect 2-3 times per day. If it looks worse at any time he may need to have a filler put in the defect. ( https://www.agradi.com/betadine-solution.htm )

Thanks for reaching out about Muddy and including photos. By the photos, the lesions do not appear serious. White lesions can appear from other traumas, of which algae can invade. Scrubbing the shell, and keeping water quality good, should work well. If lesions grow, seeking an appointment with a reptile veterinarian is recommended. Good luck.

Thanks for reaching out about Yurtle and including a photo. Clean the foot with a gently soap and topically apply a broad spectrum antibiotic such as Neosporin. Keep dry for a few days and removed any substrate that can attach to the wound, replaced with paper towels. If lesion progresses, a veterinary visit is recommended. Good luck.

It could be local infection. Monitor it for change or growth. You can gently cleanse the area using diluted betadine or chlorhexidine once or twice daily. Confirm adequate water quality to prevent secondary infection and to promote healing. Consider increasing the water and basking temperatures by a few degrees to aid in recovery. Ideally, a UVB light source should be provided for 12-14 hours daily. It should be no more than 14 inches away from the basking spot and unblocked by either glass or plexiglass for maximum benefits. If the spot does not heal or spreads, have Tabby examined by your veterinarian or a vet experienced in treating reptiles. You can read more about care at this link: http://www.anapsid.org/reslider.html