Approach to red, scaly eruptions in the older patient.

BACKGROUND: Older patients with a red scaly eruption often present first to a primary care practitioner. A thorough clinical assessment can help delineate between common causes and assist the clinician with the next steps in management.

OBJECTIVE: This article discusses the assessment of acute- to subacute-onset erythematous and scaly plaques that are present on multiple body sites in a patient aged >65 years.

DISCUSSION: The differential diagnosis of a red, scaly rash in an older patient includes atopic dermatitis, psoriasis, generalised drug eruption, tinea, scabies and non-bullous pemphigoid. Less common causes include subacute cutaneous lupus and mycosis fungoides. If the diagnosis is unclear after clinical assessment, a skin biopsy sent for histopathology, and/or direct immunofluorescence can be very useful. Management requires consideration of physical impairments, carer availability and cost.