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Use dermoscope to identify inflammatory dermatoses with facial erythema as the main feature and other atypical clinical manifestations. By reviewing the clinical data and dermoscopic images of outpatients in our hospital, four diseases of rosacea, seborrheic dermatitis, contact dermatitis and atopic dermatitis were screened out, and their dermoscopic characteristics were obtained: Rosacea is a diffuse distribution of polygonal blood vessels on a red or purple background; SD is an atypical vascularity on a yellow-red background with an oil-drop reddish halo around the hair follicle. Contact dermatitis is linear blood vessels and pleomorphic blood vessels in a light red background; AD is punctate blood vessels and spherical blood vessels under a light red background with a visible scaly distribution. Honeycomb pigmentation can be seen in seborrheic dermatitis and contact dermatitis. Combined with relevant clinical reports, the application of dermoscope in clinical diagnosis and treatment are discussed.