Introduction
Botulinum toxin serotype A (BTX-A) has become the most popular non-surgical cosmetic treatment owing to its controllable side effects and satisfactory treatment outcomes. In rhytidectomy, BTX-A can be used to treat dynamic wrinkles on the upper face. The most frequently observed adverse reactions are systemic symptoms, followed by headache and local cutaneous reactions. Other side effects include sensory disturbances, muscular abnormalities, edema, facial paralysis, dizziness, and dysphagia.1 Allergic reactions to BTX-A are occasionally reported.2 After the outbreak of COVID-19, the number of allergy cases has increased.3,4 However, no allergic reactions have been reported when BTX-A is used concomitantly with β-lactam.
We report a case of an urticaria-like reaction caused by the administration of the…