Abstract

Microneedling is a common minimally invasive procedure for skin rejuvenation. Granulomatous reactions after microneedling have been rarely reported. To systematically review the literature for granulomatous reactions from microneedling. A systematic review of the Medline, Scopus, Google Scholar, and Cochrane databases was performed for articles describing granulomatous reactions to microneedling. Thirteen studies were selected for inclusion after full-text review, which described 15 patients (26-74 years old) with non-necrotizing granulomatous inflammation postmicroneedling. Motorized microneedling pen use and topical Vitamin C application were implicated in a majority of cases. Although delayed-type hypersensitivity was commonly proposed as the underlying etiology, patch testing or further workup was rarely performed. Improvement or clearance occurred inconsistently with myriad treatment options, including topical steroids, oral antibiotics, and systemic anti-inflammatory medications. Granulomatous reactions to microneedling and microneedling-mediated transepidermal drug delivery can rarely occur and may be treatment-resistant.

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