Formic acid, also known as formic acid, is a chemical that is corrosive and can cause certain harm to the human body after contact with the skin, including skin irritation, mucous membrane irritation, and acute chemical pneumonitis. 1. Skin irritation. Formic acid in contact with the skin may lead to skin blisters, redness, swelling, pain, ulcers and other irritation. 2. Mucosal irritation. When formic acid enters the respiratory tract and conjunctiva through direct contact or inhalation, it may cause rhinitis, acute pharyngolaryngitis, bronchitis, conjunctivitis, and eyelid edema. 3. Chemical pneumonia. When formic acid enters the lungs through the respiratory tract, it can cause inflammation of the lungs and acute pulmonary edema. The human body in contact with formic acid, must immediately go to the regular hospital, and under the guidance of the doctor for standardized treatment.