Alternaria alternata infection can lead to a range of complications depending on the severity and location of the infection. In the case of respiratory allergies, exposure to Alternaria alternata spores can lead to severe asthma attacks, which can be life-threatening if left untreated. Infections of the skin and nails can lead to the development of chronic conditions if not treated promptly and effectively. Additionally, some individuals with weakened immune systems may be at risk of developing systemic infections, which can be difficult to treat and can have serious consequences. It is important to seek medical attention if you suspect you have an Alternaria alternata infection to prevent potential complications.