No, keratosis is not a vitamin deficiency. Keratosis is a condition that can affect the skin, causing it to become rough and scaly. It is not caused by a vitamin deficiency, but can be caused by other factors such as sun exposure, genetics, or even skin allergies. Keratosis can range from mild and harmless to severe and requiring medical attention. Treatment for keratosis may involve topical creams, laser therapy, or even surgery depending on the severity of the condition. Keratosis is not related to any vitamin deficiency, however, having a healthy balanced diet rich in vitamins and minerals can help keep the skin healthy and can help prevent the occurrence of keratosis.