Eczematous Skin Rash - Differential Diagnosis Algorithm
Eczematous - Pruritic/Scaly/Erythematous lesions. Usually poorly demarcated
• Atopic Dermatitis (Eczema) Erythematous papules and vesicles (acute) or lichenification (chronic)
• Nummular Dermatits (Discoid Eczema) - Coin shaped (discoid) erythematous plaques. Usually on lower legs
• Seborrheic Dermatitis - Yellowish-red plaques with greasy distinct margins on scalp/face/central chest folds
• Stasis Dermatitis - Erythematous eruption on lower legs. Secondary to venous insufficiency. +/- pigmentation, edema, varicose veins, venous ulcers
• Dyshidrotic Eczema (pompholyx) - Deep-Seated tapioca-like vesicles on hands/feet/sides of digits.
• Contact Dermatitis - Well-demarcated erythema, papules, vesicles, erosions scaling confined to area of contact
- Irritant - Rapid onset, requires high doses of the agent. May occur in anyone
- Allergic - Delayed onset (12-72 hrs). Very low concentrations sufficient. Occurs only in those sensitized
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