๐ ็ธฝ็ฎ้ ๏ฝ ๐ ่ฑๆๅๆ๏ผๆฌ็ฏ๏ผ ๏ฝ ๐ ๅฎๆด็ฟป่ญฏ ๏ฝ โญ ็ฒพ่ฏ็ญ่จ
Radiofrequency
Radiofrequency
Radiofrequency (RF) is a novel treatment method that heats the tissue through electric currents, instead of photon absorption. The energy resulting in selective thermal injury in this method is not absorbed by melanin. When pulsed light and RF are used in combination, adverse effects such as superficial blisters, burns, pigmentation disorders, and scarring are reduced, as optical energy is minimized while RF energy is kept high. One study reported improvement in inflammatory lesions through reducing the size of
the sebaceous glands and quantity of perifollicular lymphocytic infiltrates.51 A more recent approach has been used to deliver high-intensity RF by insulated microneedles, which result in deep thermal injury to layers of dermis without affecting the epidermis. Thus, energy can be focused on multiple depths of the dermis for all skin types.52
Overall, RF has been used as a single nonablative device in two acne treatment studies. The results of both studies suggest that RF offers a promising nonablative treatment alternative for acne, although further investigation is necessary to provide information concerning effective protocols, duration of efficacy, and reproducibility of results.8
While there is evidence to support the efficacy of light-based therapies, it is difficult to draw conclusions and firmly rank each method with regard to efficacy due to mixed results in the literature, methodological limitations, and small sample sizes. Thus, more randomized controlled trials with larger sample sizes are needed to better assess the merits of light-based therapy.30