PMC10364813_01
Facial image of the PD patient. Erythema and papules can be seen around the wing of nose and mouth without scales.
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Approximately 5 mm of skin area separated the lesions, and the lip was not invaded (Figure 1).
RCM features of PD patient (A) Dilated and congested vessels in the superficial dermis, with increased vascular density. (B) No pigmentation in the epidermis. (C) The spinous layer showed slight edema. (D) Dermis was infiltrated by inflammatory cell, without melanophages.
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The dilation and congestion of superficial dermis blood vessels, an increasing vascular density and accelerated blood flow, and a greater abundance of infiltrated inflammatory cells were also detected (Figure 2). 
Facial image of the PD patient after treatment. The erythema and papules around the wing of nose and mouth were significantly improved.
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The erythema and papules mostly subsided after a month (Figure 3).
RCM features of PD patient after treatment (A) Vascular dilation and congestion were improved. (B) No pigmentation in the epidermis. (C) No obvious edema in the spinous layer. (D) No inflammatory cells were detected in the dermis.
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RCM examination found no obvious oedema in the spinous layer, vascular dilation and congestion were improved, and no inflammatory cells were detected in the dermis (Figure 4).