RESUMEN
BACKGROUND: Hyaluronic acid-based dermal fillers are the cornerstones of wrinkle correction and facial contour redefinition. OBJECTIVE: To assess the efficacy and safety of ESTLF compared with RESL for the treatment of nasolabial folds (NLFs). MATERIALS AND METHODS: In this prospective, split-face, randomized, investigator and subject-blinded trial, 45 subjects with moderate-to-severe symmetrical NLFs were randomized to ESTLF on one side of the face and RESL on the other side and were followed up for 9 months. The primary end point was change in WSRS score from the baseline to Month 1 (M1). Secondary end points included changes in WSRS score at other time points, aesthetic improvement, wrinkle volume quantification, adverse events, and local tolerance. RESULTS: The efficacy difference between ESTLF and RESL at M1 was in favor of ESTLF (-0.16, CI, -0.28 to -0.03]), demonstrating its noninferiority. Considering other time points, significant differences were observed at 3 and 6 months for ESTLF, assessed with WSRS, GAIS, or NLF volume quantification. Both treatments were well tolerated. CONCLUSION: ESTLF is effective and well tolerated for the treatment of NLFs.
RESUMEN
Sensitive skin is a clinical syndrome characterized by the occurrence of unpleasant sensations, such as pruritus, burning or pain, in response to various factors, including skincare products, water, cold, heat, or other physical and/or chemical factors. Although these symptoms suggest inflammation and the activation of peripheral innervation, the pathophysiogeny of sensitive skin remains unknown. We systematically analysed cutaneous biopsies from 50 healthy women with non-sensitive or sensitive skin and demonstrated that the intraepidermal nerve fibre density, especially that of peptidergic C-fibres, was lower in the sensitive skin group. These fibres are involved in pain, itching and temperature perception, and their degeneration may promote allodynia and similar symptoms. These results suggest that the pathophysiology of skin sensitivity resembles that of neuropathic pruritus within the context of small fibre neuropathy, and that environmental factors may alter skin innervation.