Objective: LIDOCAINE HYDROCHLORIDE is the favored anesthetic agent used in outpatient surgical procedures. Adverse reactions to lidocaine are uncommon. The purpose of this case report is to present the case and the symptoms, as well as our diagnosis and the further measures taken in managing the patient's condition. The basic goal of this case report has been to trigger the start of more thorough studies regarding this type of hypersensitivity to Lidocaine. Material and Methods: A 12-year-old boy with the chief complaint of deep caries in his right upper and lower primary second molars and the need for extraction was referred to the dental office. After the injection of lidocaine, he returned with edema around his eyes and a general edematous face appearance, but had no itching. Results: To initially suppress the symptoms, the case was prescribed a single dose of Dexametasone. The patient returned to the office the next day, with the edema still persistent. This time we prescribed Betametasone for the patient. After the stages of prednisolone therapy, the patient was monitored again, and was discharged successfully. Conclusion: The patient's symptoms lead us to the diagnosis of a hypersensitivity reaction to lidocaine. Once the diagnosis was confirmed, the patient was given an emergency dose of Dexametasone to which he showed no signs of relief. The final prednisolone therapy finally relieved the patient's symptoms. [ABSTRACT FROM AUTHOR]