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 also 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 main cause of inflammatory scaly skin around the mouth and lips? Here is a brief description. The main cause of inflammatory squamous skin around the mouth and lips: the child’s mouth is small during infancy and teething, and the child licks his lips or sucks his fingers too much and many other factors, leading to the persistence of the cause of drooling, plus the thin skin of infants, local allergies, scratching and clothing friction and other irritating factors, which makes it easy to form eczema around the mouth, and also leads to recurrent eczema around the mouth. Environmental factors: many studies have confirmed that environmental factors are one of the important reasons for the increased prevalence of eczema, the environment includes the group environment and the individual environment, the human group environmental pathogenic factors are outdoor air, water, soil, radioactive sources, large areas of allergenic pollen vegetation, large areas of airborne allergenic sources, etc., the individual small environment refers to the individual living environment, as people live about 2/3 of the time in Indoor, therefore, the individual small environment on eczema more closely, the impact of environmental factors mainly refers to the increasing and complex environmental allergens. Infectious factors: some eczema and microbial infections, these microorganisms include Staphylococcus aureus, Malassezia, airborne fungi such as Streptomyces, Mycosphaerella, Penicillium punctatum, Aspergillus fumigatus, Fusarium, Aspergillus flavus, Aspergillus niger and Rhizopus niger.