Hemoptysis after COVID-19 and the importance of differential diagnosis: Birt-Hogg-Dubé syndrome.

Birt-Hogg-Dubé syndrome is a genodermatosis of autosomal dominant inheritance characterized by mutations in the folliculin (FLCN) gene. There is an inappropriate inhibition/activation of a protein, the foliculin, which may cause tumor lesions in skin, renal and lung lesions; they could have more risk of developing pneumothorax compared to the normal population. A 38-year-old male patient with bronchial asthma who consulted for hemoptysis three weeks after recovery from COVID-19 infection.