PMC9849916_01
Changes in neck erythema in the patient. (A). Neck erythema on the 1st day; (B). Neck erythema on the 2nd day; (C). Neck erythema on the 3rd day; (D). Neck erythema on the 4th day; (E). Neck erythema on the 5th day; (F). Neck erythema on the Day 8; (G). Neck erythema on day 10; (H). Neck erythema on day 14.
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Technology Development Co., ltd., Beijing, China.) injection in the neck at a private clinic three weeks previously, with no adverse reactions. The patient suddenly noticed erythema on the neck (Figure 1A) but made no timely visits due to work commitments. We instructed the patient to take neck photographs daily (Figure 1B and C). Physical examination revealed linear erythema on the neck with pruritus, which was soft and painless (Figure 1D). After two weeks, the erythema resolved spontaneously (Figure 1E-H).