Differential Diagnosis of Skin Sloughing Rash

Critical Life-Threatening Conditions to Rule Out First

The American College of Physicians and other medical societies recommend that a rash that looks like skin is falling off most urgently suggests Stevens-Johnson syndrome (SJS), toxic epidermal necrolysis (TEN), or Drug Reaction with Eosinophilia and Systemic Symptoms (DRESS), all of which are life-threatening conditions requiring immediate hospitalization and discontinuation of all suspected causative agents 1, 2
When skin sloughing exceeds 30% of body surface area (BSA) with associated symptoms such as erythema, purpura, or epidermal detachment, this represents Grade 4 skin toxicity requiring immediate emergency hospitalization, according to the National Institutes of Health 2
Skin or mucous membrane detachment, vesicles, pustules, purpura, or mucous ulcerations are key distinguishing features of SJS and TEN, as stated by the American Academy of Dermatology 1
Typically, SJS and TEN occur after the 6th week of treatment with certain medications, such as protease inhibitors, immune checkpoint inhibitors, or EGFR inhibitors, as reported by the European Society of Medical Oncology 1
The American College of Cardiology recommends that all treatments must be discontinued immediately in cases of SJS or TEN 1
DRESS presents with diffuse skin involvement exceeding 50% BSA, often accompanied by eosinophilia and systemic symptoms, and requires immediate discontinuation of triple therapy and emergency hospitalization, according to the Infectious Diseases Society of America 1

If >30% BSA with skin detachment, vesicles, or mucosal involvement, suspect SJS/TEN or DRESS and discontinue all medications immediately, as recommended by the American Medical Association 1, 2
Initiate IV methylprednisolone 1-2 mg/kg and emergency hospitalization with dermatology consultation for SJS/TEN, as stated by the Society of Critical Care Medicine 2
Obtain punch biopsy and clinical photography for diagnosis, as recommended by the American Academy of Dermatology 2
Consider Grade 2-3 drug-induced dermatitis if 10-50% BSA without skin detachment, and withhold causative agent, as stated by the National Institute for Occupational Safety and Health 1, 2

Discontinue all suspected medications and initiate IV methylprednisolone 1-2 mg/kg for Grade 4 skin necrosis/sloughing >30% BSA, as recommended by the American College of Surgeons 1, 2
Emergency admission to burn unit or intensive care is required for Grade 4 skin necrosis/sloughing, as stated by the American Burn Association 2
Urgent dermatology and wound specialist consultation is necessary for Grade 4 skin necrosis/sloughing, as recommended by the Wound, Ostomy, and Continence Nurses Society 2, 8
Withhold causative agent until Grade 1 or less, and use systemic corticosteroids and high-potency topical steroids for Grade 3 moist desquamation, as stated by the American Academy of Dermatology 2, 7

Do not delay treatment waiting for the classic triad of symptoms, as early recognition and intervention are critical for survival in SJS/TEN and RMSF, as recommended by the Centers for Disease Control and Prevention 3, 4
Avoid topical antibiotics prophylactically; reserve them only for documented superinfection, as stated by the Infectious Diseases Society of America 8

Immediate dermatology consultation is required when Grade 2 or higher skin lesions develop with suspected drug reaction, or when there is any suspicion of SJS, TEN, or DRESS, as recommended by the American Academy of Dermatology 1, 2
Skin sloughing exceeding 30% BSA, presence of mucosal involvement or systemic symptoms, also require immediate dermatology consultation, as stated by the American College of Physicians 1, 2