<unk>  is a condition affecting the epithelial surfaces of the body. It is caused by a dietary deficiency of vitamin A, a fat-soluble vitamin that is most often found in fats, milk, and some leafy vegetables.
Keratinizing metaplasia
Squamous metaplasia
Glandular metaplasia
Hyperkeratinization
Moist desquamation
Intestinal metaplasia
Epithelial dysplasia
Keratin pearl