Symptoms of perioral eczema include inflammatory scaly skin around the mouth and lips, and dry, cracked and painful lips and mouth. The rash is caused by the child’s excessive lip licking or finger sucking, which causes saliva to irritate the surrounding skin. Once those bad habits are changed, the perioral eczema will disappear quickly. Many factors related to the small size of the mouth and teething during infancy make it easy for eczema to form around the mouth. Since the cause of drooling persists, the eczema around the mouth is recurrent. So what is the differential diagnosis of inflammatory scaly skin around the mouth and lips? The following is an overview. The differential diagnosis of inflammatory squamous skin around the mouth and lips: 1, perioral dermatitis: the appearance of papules, papules, pustules, erythema, desquamation and other damage around the mouth, nasolabial folds, etc., in periodic episodes. The onset is unknown and the pathogenesis is unclear. Treatment is based on avoiding all exogenous stimuli, oral tetracycline and minocycline are effective, and metronidazole is not effective for this disease. This disease belongs to the category of lip wind, tight lips and Shen lips in Chinese medicine. 2, pigmented perioral erythema: also known as facial pigmented red disease, Brocq pigmented perioral erythema. Clinical manifestations are erythema and hyperpigmentation in the middle of the face, especially in the perioral area. 3, eczema (eczema): is a common inflammatory skin disease of the epidermis and superficial dermis caused by a variety of internal and external factors. It is characterized by intense pruritus, polymorphic lesions, symmetrical distribution, tendency to exude, chronic course, prone to recurrent episodes.