Scaly lesions

DDx

• Atopic dermatitis (eczema)
• Seborrheic dermatitis
• Psoriasis
• Tinea, eg, tinea corporis, cruris, or pedis
• Contact dermatitis
• Stasis dermatitis (due to venous insufficiency)
• Xerosis (dry skin)
• Lichen simplex chronicus (circumscribed neurodermatitis)
• Tinea versicolor (pityriasis versicolor)
• Nummular eczema (discoid eczema, nummular dermatitis)
• Intertrigo
• Secondary syphilis
• Pityriasis rosea
• Chronic cutaneous lupus (discoid lupus)
• Exfoliative dermatitis (exfoliative erythroderma)
• Actinic keratoses
• Cutaneous T cell lymphoma (mycosis fungoides)
• Bowen’s disease (squamous cell carcinoma in situ)
• Paget’s disease
• Pityriasis rubra pilaris