Radiofrequency (RF) is used in treating catheter ablation for atrial fibrillation, coronary sinus ostium (CSOS), lung tumors, Lumbar Spinal Stenosis, hemodialysis (HD) patients with hepatocellular carcinoma (HCC), hepatocellular carcinoma, and the list just keeps going. RF is a standard medical treatment for many diseases and conditions. There are reports published that RF is used to treat rosacea.
In medicine, "Radio frequencies at non-ablation energy levels are sometimes used as a form of cosmetic treatment that can tighten skin, reduce fat (lipolysis), or promote healing." Wikipedia
"A technology called ELOS (electro-optical synergy) combines pulsed light or laser with bipolar radiofrequency....The results of this study suggest that the combination of optical and RF energies is effective for the treatment of rosacea. ELOS, as well as other vascular-focused lasers and light sources, provides an important treatment option for patients who fail medical therapy, reach a plateau in their response to medical therapy, or wish to avoid chronic oral therapy." 
"Radiofrequency therapy was as effective as pulsed dye laser in treating rosacea, particularly in patients with papulopustular rosacea, according to published study results" 
"Fractional microneedling radiofrequency (FMR) therapy resulted in modest but clinically significant improvements in the appearance and inflammation of rosacea in a small study of patients with mild to moderate rosacea." 
Resolve Skin Laser Clinics in the United Kingdom specializes in RF for Rosacea.
A "new hand-held device fires a light beam, but also emits radio frequency energy waves... [and] fires energy waves and light has been developed to treat rosacea and other skin conditions." Daily Mall
You may want to ask your physician about RF as an option for your particular rosacea diagnosis.
 J Clin Aesthet Dermatol. 2008 May;1(1):37-40.
Successful treatment of erythematotelangiectatic rosacea with pulsed light and radiofrequency.
Taub AF, Devita EC.
 Dermatologic Surgery: February 2017 - Volume 43 - Issue 2 - p 204–209
Comparative Efficacy of Radiofrequency and Pulsed Dye Laser in the Treatment of Rosacea
Kim, Sue-Jeong MD; Lee, Young MD; Seo, Young-Joon MD; Lee, Jeung-Hoon MD; Im, Myung MD
Article in PubMed
 Rosacea improved with fractional microneedling radiofrequency therapy
December 7, 2016 by Bianca Nogrady, Dermatology News
Edited by Brady Barrows