Facial seborrheic dermatitis can present with redness and cracking of the nasolabial folds. It begins with redness of the nasolabial folds and iterative, corn-sized papules. There is usually localized pain due to the cracked skin. Redness and cracking of the nasolabial folds are thought to be related to heredity, altered sebum metabolism, microbial parasitism, neurologic dysfunction, and dietary habits. It has been hypothesized that the disease occurs due to an increase in sebum secretion and changes in chemical composition, so that the normal flora originally present on the skin grows and reproduces in large quantities to invade the skin. So what is the diagnosis of nasolabial fold redness and cracking? Chapped nasolabial folds can generally be diagnosed based on symptomatic features. Facial seborrheic dermatitis often spreads from the scalp, the face before the forehead, supraorbital, eyelids, nasolabial folds especially. At the beginning of the affected area redness, iterative corn size papules, its color reddish, for a long time will be fusion, color yellow red, covered with greasy thick crust, such as paste like fat, or Zinshui yellow sticky, itching more than the eyebrows often due to scratching and sparse off, nasolabial folds and behind the ears can be cracked. Note that according to the characteristics of the skin lesions and the distribution site to identify the following diseases: 1, head and face psoriasis. 2, pityriasis rosea. 3, ringworm. 4, erythematous pemphigoid. 5, rosacea dermatitis. Pay attention to identify the physiological nasolabial folds reddened and cracked due to weather changes, as well as the nasolabial folds cracked due to seborrheic dermatitis.