Introduction: The treatment of ingrown nails can be conservative or more invasive, including surgical methods. Surgical treatment through matricectomy is the most effective and can be performed mechanically or chemically.Although phenol is the most commonly used agent, trichloroacetic acid has led to satisfactory results in the partial chemical matricectomy of ingrown nails.
Objective:To describe the use of trichloroacetic acid as an option to treat ingrown nails. Methods: 33 patients were analyzed, with 37 ingrown nails subjected to matricectomy with 50% trichloroacetic acid following the partial exeresis of the nail plate. Acute phenomena were assessed in the immediate post-operative period. Treatment effectiveness regarding the recurrence of the ingrown nail in the treated site was assessed 7 to 24 months after the procedure.
Results: The treatment’s success rate was 70.72%. Light post-surgical exudation, the absence of tissular necrosis and good healing process were observed.
Conclusion: Trichloroacetic acid matricectomy is an effective treatment for ingrown nails: it causes few side effects, is easy to perform and has good resolution rates.

Introdução: The increase in the demand for cosmetic procedures has in turn stimulated the search for effective and safe analgesia.Topical anesthetics are an alternative to infiltrative anesthesia, and promote an appropriate analgesia without inducing adverse effects. Objective: To compare the pain ratings of two topical lidocaine formulations in patients undergoing fractional CO2 laser therapy. Methods: Eight patients underwent a single fractional CO2 laser session after applying a commercial formulation of 4% lidocaine on the right side of the face and a dispensed 30% lidocaine formulation combined with 7% tetracaine on the left side of the face.The intensity of the pain was assessed using the visual analogue pain intensity scale at the end of the procedure. Results: No significant statistical differences were detected between the formulations. Conclusions: Formulations with high concentrations of anesthetics are not more effective than commercial products in producing analgesia.

Keywords: ANESTHETICS, ANESTHESIA AND ANALGESIA, LASERS