Vitiligo is not considered in the clinical differential of rosacea. The differential diagnosis largely depends on the pattern of rosacea. Erythematotelangiectatic rosacea can resemble seborrheic dermatitis or lupus erythematosus. Carcinoid syndrome and mitral valve incompetence are overlooked causes of erythema and telangiectasia. Acneiform rosacea may be simulated by acne, bromoderma and iododerma, perioral dermatitis, and pustular folliculitis. The papules of rosacea may at times resemble cutaneous sarcoidosis. A skin biopsy is sometimes performed to exclude some of the diagnoses listed above.
For more on the workup of rosacea, read here.
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Cite this: William James, Steven Brett Sloan. Fast Five Quiz: Can You Recognize and Properly Treat Rosacea? - Medscape - Jul 24, 2019.