| Grade | Definition |
|---|---|
| 1 | Simple redness on the skin |
| 2 | Erythema, edema, sclerema, blisters, epidermal detachment |
| 3 | Skin loss with exposed fat layer |
| 4 | Skin necrosis including the fascia or muscle layer |
| 5 | Complete necrosis of skin, fat, and muscle layer |
| 6 | Bone attacks including periostitis, osteitis., osteomyelitis |
| 7 | Suppurative arthritis, including osteomyelitis, pathological fracture, dislocation of the joint, and a case of sepsis. |