Background: Many people are still infected with coronavirus disease 2019 (COVID-19), and the use of home test kits for diagnosis is becoming common. The misuse of the kits may cause unexpected patient harm. Purpose: The purpose of this case study was to report a rare case of facial skin necrosis caused by contact with a reagent in a COVID-19 Ag home test kit due to misuse of the kit. Case Study: A 50-year-old male patient with pain, redness, and swelling throughout the nose, right ocular area, and forehead visited the emergency room of the hospital. The symptoms were caused by using a COVID-19 Ag home test kit in the wrong way. Initially, partial skin color change and ulcerative skin lesions with pus-like discharge were observed throughout the wound. Finally, partial skin necrosis progressed and was treated using appropriate dressing treatment, antibiotics, and steroids. Conclusion: The use of COVID-19 Ag home test kits that can be easily used will gradually increase. As in this case, it should be kept in mind that problems due to incorrect use of COVID-19 Ag home test kits can occur, and initial treatment is important to prevent systemic infection or scar formation. Introduction: De nombreuses personnes contractent encore des infections par la COVID-19, et l'utilisation des tests & agrave; domicile se g & eacute;n & eacute;ralise. Le m & eacute;susage de ces tests peut & ecirc;tre responsable de pr & eacute;judices inattendus chez les patients. Objectifs: Dans la pr & eacute;sente & eacute;tude de cas, les chercheurs signalent un rare cas de n & eacute;crose de la peau du visage caus & eacute;e par le contact avec un r & eacute;actif du test antig & eacute;nique de d & eacute;pistage & agrave; domicile de la COVID-19. & Eacute;tude de cas: Un homme de 50 ans pr & eacute;sentant de la douleur, des rougeurs et un oe d & egrave;me de tout le nez, de la r & eacute;gion oculaire droite et du front a consult & eacute; & agrave; l'urgence de l'h & ocirc;pital. Ses sympt & ocirc;mes & eacute;taient caus & eacute;s par la mauvaise utilisation d'un test antig & eacute;nique de d & eacute;pistage & agrave; domicile de la COVID-19. Au d & eacute;part, un changement de couleur partiel et des l & eacute;sions ulc & eacute;reuses ont & eacute;t & eacute; observ & eacute;s sur la plaie. La n & eacute;crose partielle de la peau a & eacute;volu & eacute; et & eacute;t & eacute; trait & eacute;e & agrave; l'aide de pansements appropri & eacute;s ainsi que de la prise d'antibiotiques et de st & eacute;ro & iuml;des. Conclusion: L'utilisation du test antig & eacute;nique de d & eacute;pistage & agrave; domicile de la COVID-19, facile & agrave; utiliser, augmentera graduellement. Comme dans le pr & eacute;sent cas, il faut tenir compte de la possibilit & eacute; de la mauvaise utilisation de ce test et de l'importance d'un traitement initial pour & eacute;viter une infection syst & eacute;mique ou la formation de cicatrices.
