Internet provided the diagnosis of shell rot for the lady owner. Many treatments on the net but she had no success with betadine. Consulted me today.
This terrapin is well nourished. Lays around 20 eggs per year for the last 10 years. She lives alone on a plastic tank. Lately, the lower shell (plastron) has red streaks of blood indicating shell rot below. Painful as the terrapin would respond when the red streaks were touched.
Neck wound due to attempts to escape from plastic tank.
Ventral feet had wounds due to paddling to "lay eggs".