Pterygium inversum unguis secondary to gel polish.

Background Pterygium inversum unguis (PIU) is characterized by the abnormal adherence of the hyponychium to the ventral surface of the nail plate. It can be both unsightly and painful, resulting in morbidity for patients. Gel polish is a popular nail cosmetic that has been reported to cause several complications. PIU may be another adverse outcome. Objective To highlight a newly recognized adverse effect of a popular beauty technique. Methods This retrospective and prospective case series reports 17 women who developed PIU after gel polish use. All study-related activities occurred at a University of Miami dermatology outpatient clinic. Results All 17 subjects developed PIU after two to five years of gel polish application. Nine of 17 patients reported using both UVA and LED light to cure gel polish. Of the remaining eight, five used LED light only and three did not know or could not remember. All but two patients had a resolution of PIU a few weeks after switching from gel polish to regular polish manicures. Conclusion While it remains undiscerned whether PIU is related to chemicals present in the gel polish or to the application and/or removal process of such, patients and dermatologists should be aware of the potential risks of gel manicures.