Sodium benzoate is a disinfectant and antiseptic drug, and is often used clinically in combination with salicylic acid for the treatment of superficial fungal infections or fungal infections of the skin such as ringworm, ringworm of the hands, and ringworm of the feet. Sodium benzoate can cause allergic symptoms such as asthma, lip and mouth edema, tongue edema, rhinitis, urticaria, angioneurotic edema, etc. Therefore, it is prohibited for patients who are allergic to sodium benzoate and salicylic acid. Sodium benzoate is corrosive and can cause contact dermatitis. It can cause strong irritation to eyes and mucous membranes, so contact with eyes or sensitive parts of mucous membranes should be avoided when using sodium benzoate. Sodium benzoate is generally used as a second-line drug to treat fungal infections, so consult a medical professional before using sodium benzoate.