| Symptom/sign | Degree 1 | Degree 2 | Degree 3 | Degree 4 |
| Erythema | Minimal, transient | Moderate <10% BSA | Marked 10 to 40% BSA | Severe >40% BSA |
| Sensation/itching | Pruritus | Slight, int. pain | Moderate persistent pain | Severe persistent pain |
| Blistering | Rare | Rare hemorrhage | Bullae | Bullae hemorrhage |
| Desquamation | Absent | Patchy, dry | Patchy, moist | Confluent, moist |
| Ulcer/necrosis | Epidermal only | Dermal | Subcutaneous | Muscle or bone |
| Onycholysis | Absent | Partial | Partial | Complete |
