INTRODUCTIONSubstances that can cause chemical burns in skin and mucosas are improper-ly packaged in beverages or medication containers, or even packages of harmless appearances. CASE PRESENTATIONA 33 year old woman dropped in her nose a product based on nitric oxide, known as “strong water” and professionally used by her husband. The bottle with the acid was mistaken for the bottle of a topi-cal nasal decongestant. She complained of intense pain, burning sensation, nasal obs-truction and tearing. Rhinoscopy showed a burn on the nasal wing and on the nasal vestibule, of yellowish color, surrounded by erythema (Figure 1). Her nose was flu-shed for 15 minutes with her head down. She was then instructed to flush the affec-ted place daily, avoid sun light exposure and use analgesic. Six months of follow up did not reveal sequelae.DISCUSSIONThe authors did not find in the literature any case report about nitric acid being accidentally poured in the nose. Nitric acid is liquid at room temperature, and it varies between transparent and yellow, and it may even be brown or re-ddish in color, and bears a strong odor1. Nitric acid is used in the manufacture of pesticides, fertilizers, explosives, in the pharmaceutical industry and to clean and make metals shine.Since there is no specific treatment for burns caused by nitric acid, the therapy advocated is support only. The toxicology service must be consulted. Steroids are used empirically in pulmonary symptoms1. We are unsure whether nasal topic steroids or systemic steroids may be of any benefit in nasal injuries.It is possible that patients with chronic rhinitis be particularly prone to accidents like this. Population education and health care professionals’ awareness are important aspects in the prevention of intoxication in rhinitis patients