PMC9904292_01
Prior treatment: picture taken at the clinic shows nonhealing, infiltrating erythema, umbilical concave papules and pustules on the right side of the face and nose (A); dermoscopy revealed generalized erythema, a yellowish, structureless area ((B), dark arrow), clustered pustules ((C), blue arrow), which resemble fried eggs on a dark red background, and vellus hair loss ((C), dark circle).
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Some papules were umbilical concave, with local necrosis and crusting, and the skin lesions were well-defined (Figure 1A). Unpolarized contact dermoscopy at x20 magnification revealed generalized dark erythema, yellowish, structureless areas (Figure 1B, dark arrow), and clustered pustules (Figure 1C, blue arrow), which resembled fried eggs on a dark red background. Vellus hair loss was noted in some lesions (Figure 1C, dark circle). 
Two weeks of treatment: the red swellings and papules started gradually subsiding, and the pustules had disappeared (A); dermoscopy showed yellowish, structureless areas turned into yellow dots ((B), black arrow) on a bright red background, and "fried eggs" had disappeared; vellus hair loss persisted in some lesions ((C), black circle).
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The red swellings and papules started gradually subsiding, and the pustules disappeared (Figure 2A) after two weeks of treatment. Dermoscopy showed yellow dots (Figure 2B, black arrow) on a bright red background, "fried eggs" had disappeared, but vellus hair loss was still noted in some lesions (Figure 2C, dark circle).
Six months of treatment: the lesions had significantly resolved (A); dermoscopy revealed linear and dendritic vessels ((B), dark arrow) on a pink background, and yellow dots have disappeared; vellus hair had returned (C).
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Three months later, the infiltrating erythema and papules had mostly subsided, and after six months, the lesions had significantly resolved (Figure 3A). Dermoscopy revealed linear and dendritic vessels (Figure 3B, dark arrow) on a pink background, yellow dots had disappeared, and the vellus hair had returned (Figure 3C).