Vinegar has some harmful effects on the skin. The main component of vinegar is acetic acid, which is an acidic chemical that may cause damage to the skin’s stratum corneum if it is repeatedly applied to the skin, and may ultimately, due to repeated stimulation, cause overgrowth of the skin’s stratum corneum, resulting in the formation of abnormally keratinized skin, roughness, or localized changes and so on. Some people are sensitive to acetic acid and may form irritant dermatitis, which may cause itching, erythema, and even inflammatory oozing reactions of the skin. If you use vinegar to disinfect your skin, it is okay to do so occasionally, but if you use it regularly, it may cause more significant damage to your skin. In addition to this, vinegar, as a food, has many additives in it, and these additives can cause unknown damage to the skin and can make it more fragile and sensitive. It is still okay to add the right amount of vinegar to flavor your cooking. Vegetables and fruits are a source of vitamin C, but vitamin C is easily damaged in cooking, and adding the right amount of vinegar protects and reduces the loss of vitamin C, which is good for the skin. Therefore, it is not recommended to use vinegar directly on the skin. If vinegar must be used on the skin, it needs to be diluted and used under medical supervision.