Approach to Erythroderma

Initial Assessment and Stabilization

The American Academy of Dermatology recommends immediate supportive care with wet dressings using mid-potency topical corticosteroids, strict attention to fluid and electrolyte balance, and control of peripheral edema for all patients with erythroderma 1
Patients with erythroderma should be assessed for airway patency and vital signs, including temperature, heart rate, blood pressure, and oxygen saturation, with involvement of anesthesia if necessary 2

A comprehensive laboratory evaluation, including complete blood count, C-reactive protein, and comprehensive metabolic panel, is necessary for patients with erythroderma 2
Flow cytometry and Sézary cell count should be performed to assess for cutaneous T-cell lymphoma or Sézary syndrome 4
T-cell receptor gene rearrangement clonality testing is recommended when lymphoma is suspected 4
HIV screening is necessary, as HIV may present as erythroderma 4

A personal and family history of psoriasis can help diagnose erythrodermic psoriasis 5
The presence of indurated plaques with silvery scale is consistent with psoriasis rather than atopic dermatitis 5
"Skip areas" (islands of normal skin) suggest pityriasis rubra pilaris rather than psoriasis 4
Palmoplantar keratoderma is characteristic of pityriasis rubra pilaris 4

The American Academy of Dermatology recommends initiating oral cyclosporine 4 mg/kg/day immediately for rapid control of erythrodermic psoriasis, with dramatic improvement expected within 2-3 weeks 1, 6
Cyclosporine 3-5 mg/kg/day is a logical first choice for systemically ill patients due to rapid and impressive onset of action 5, 7
Methotrexate, biologic agents, and acitretin are alternative systemic options for erythrodermic psoriasis 1, 4, 7

The American Academy of Dermatology advises against delaying treatment waiting for definitive diagnosis in systemically ill patients, and recommends beginning supportive care and cyclosporine empirically for suspected psoriatic erythroderma 1, 5
Acitretin should not be used as first-line in systemically ill patients due to slow onset of action 5, 7
Trimethoprim-sulfa antibiotics should not be used with methotrexate due to drug interactions 4
Male patients on methotrexate must avoid conception until 3 months after discontinuation due to effects on spermatogenesis 4

Patients with >10% body surface area epidermal detachment should be admitted to a burn unit or ICU 3
Ophthalmology examination is necessary within 24 hours if mucosal involvement is present 2
Serial assessment of fluid balance and electrolytes is necessary 1
Monitoring for secondary bacterial infection with clinical examination and cultures is recommended 2
Ambient temperature should be maintained at 25-28°C to promote healing and reduce insensible losses 8