The after-effects of a diabetes mellitus can result in defects and pressure points in the area of the foot. In this skill trainer, a gangrenous alteration on the big toe of the right foot has already spread from the back of the foot to the metatarsal. A mal perforans (trophic ulcer) is visible on the sole of the foot (plantar). A grade 3 pressure-ulcer is depicted in the heel area. A complete skin layer is lost and the subcutaneous tissue is damaged up to necrosis. This is recognisable by black colouration in the wound area. Leg not included.