The causes of seborrheic dermatitis are multifaceted. Typically, if one does not pay attention to their diet, consuming spicy, irritating, or overly greasy foods can easily lead to the occurrence of seborrheic dermatitis. Seborrheic dermatitis can also occur when there is excessive secretion of male hormones, which leads to overactive sebaceous glands. Additionally, some metabolic disorders and genetic factors are also related to the onset of seborrheic dermatitis. Furthermore, seborrheic dermatitis can be associated with a deficiency in B vitamins, as well as physical and chemical irritants. Frequent scratching of the skin or the use of overly alkaline facial cleansers can promote the occurrence and exacerbation of seborrheic dermatitis. Psychological factors can also lead to the occurrence of seborrheic dermatitis; excessive stress, anxiety, and depression can all trigger the condition.