The red border of the lips is a special anatomical formation located on the border of the skin and the oral mucosa. Being a "transitional zone". it has its own morphological and functional features. There are no salivary glands on the red border of the lips. https://yeswellneses.shop/product-category/childrens-allergy/
A case report of local precancer hyperkeratosis of red border of the low lip in a young patient
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