Etiology: after bacterial invasion, the skin tissue of the injured part is necrotic. Water pollution can also easily cause turtles to get this disease. Prevention and treatment: First, remove the focus of the affected area and apply it with chlortetracycline eye ointment once a day. If the turtle eats by itself, oxytetracycline powder can be added to the bait; If the soft-shelled turtle has stopped eating, oxytetracycline can be fed at a dose of 1 g per kilogram of soft-shelled turtle, and then the sick soft-shelled turtle can be isolated. Don't feed water, so as not to aggravate the condition. The turtle recovered and returned to the water.