https://www.selleckchem.com/GSK-3.html
Double lip is an unusual clinical finding, considered to be a developmental anomaly, and usually involving the upper lip more frequently than the lower lip. It may be seen in isolation or in association with Ascher's syndrome. It is caused by excessive areolar tissue and noninflammatory labial mucosa gland hyperplasia of pars villosa. During smiling, the lip is retracted, and the mucosa is positioned over the maxillary teeth, resulting in "cupid's bow" appearance. The incidence of this anomaly is not known. It has been reported in cleft patients,
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