A male red-eared slider has loose neck skin
Channel: Dr David Sing
Date: 27/03/2015

An older terrapin has loose neck and thigh skin. Friction caused wounds below the neck. There was no need for surgery. 
The terrapin was kept in a tank filled with water just covering the lower shell all the time. No sunlight and only one type of pelleted food. Advised dry area by sloping the tank or giving a plank, sunlight half an hour a day and variety of food. The loose neck skin could be due to the excessive fat some time ago when the slider was fatter.