Can Microneedle Fractional Radiofrequency System Treatment Impair the Skin Barrier Function in Chinese Patients? A Prospective Clinical Trial

Facial cosmetic conditions can manifest as post-inflammatory erythema, scars, pigmentation, enlarged pores, skin laxity, and photoaging. The microneedle fractional radiofrequency system (MFRS) is a new device that combines radiofrequency and microneedles and has been widely used for skin rejuvenation. Since MFRS is an invasive technique, this study aimed to evaluate whether the skin barrier functions might be impaired by this treatment, revealed by skin sensitivity and exacerbation of melasma.Twenty patients with Fitzpatrick grades III-IV facial conditions (skin laxity with melasma, n = 9; post-inflammatory erythema and scars, n = 5; and enlarged pores, n = 6) and treated with MFRS were enrolled. Transepidermal water loss (TEWL, using Ultrascan UC22), skin sensitivity (ten-item Sensitive Scale, SS-10), melanin index (MI), melasma area and severity index (MASI), red areas (VISIA), and thickness and density of the epidermis and dermis on ultrasonography were compared between baseline and 6 months after all treatment sessions.Twenty patients completed a 6-month follow-up after two MFRS treatments. During days 1-3 post-treatment, the TEWL values gradually increased to the peak and decreased to baseline levels (BD) on day 7. There was no significant difference in TEWL compared with baseline in month (M) 1, M3, and M6. There were no significant changes in the thickness and density of the epidermis. Although the thickness and density of the dermis increased, there was no significant difference compared to baseline. There was no significant difference in the MI, MASI, and SS-10 score before and after MFRS treatment. After treatment with MFRS, the red area and scarring reduced significantly (p < .01), and no significant difference was observed in other patients.MFRS is a safe and effective treatment for facial cosmetic conditions. The skin barrier function is not impaired by MFRS treatment, since it does not cause skin sensitivity or melasma exacerbation.