Radiofrequency is a noninvasive technique used to treat skin laxity by stimulating the production of collagen and elastin, two proteins essential for skin firmness and elasticity. It works by emitting electromagnetic waves through a device applied to the skin, which penetrate deeply to generate controlled heat (between 38°C and 42°C at the surface, up to 60°C in the dermis) without damaging the epidermis. This heat causes an immediate contraction of collagen fibers, producing a visible tightening effect from the very first session. It also activates fibroblasts, which are responsible for the production of new collagen and elastin fibers, gradually improving skin firmness.
The results are reflected in smoother, more toned skin, with a reduction in skin laxity that is progressively diminished over the course of sessions. The technique is well tolerated and generally does not require social downtime, aside from mild, transient redness. Although frequently applied to the face, neck, or abdomen, radiofrequency is also an effective option for addressing moderate arm laxity. A protocol comprising multiple, spaced sessions is usually recommended to achieve a long-lasting result.
A study conducted on 33 female patients demonstrated the efficacy of radiofrequency for treating skin laxity. Six radiofrequency sessions, distributed over 6 to 12 months, were required to treat the abdominal region. Several histological changes were observed, reflecting a structural improvement in the dermis and the increase in the depth of the collagen birefringence band (9.7% at 6 months), indicating long-term collagen remodeling, as well as an increase in papillary height. This term refers to the thickness of the papillary layer of the dermis, located just below the epidermis. This region is rich in blood capillaries and in fibroblasts, cells that produce collagen and elastin. This layer decreases with age, exacerbating skin laxity. According to the observations, papillary height increased by 28.9% at 6 months and by 40.3% at 12 months.
Radiofrequency may increase papillary height by reactivating biological activity in the dermis, thereby improving skin density, firmness, and texture.
Although this study focuses on the abdominal area, it can be assumed that this technique is applicable to various body regions, particularly the arms.