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What causes keratosis?

  1. Buildup of moisture in the epidermis

  2. Inflammation of the skin

  3. Buildup of skin cells on the epidermis

  4. Loss of skin elasticity

The correct answer is: Buildup of skin cells on the epidermis

Keratosis is a condition where there is a buildup of skin cells on the epidermis, also known as the outermost layer of skin. This buildup can lead to dry, rough patches of skin that may be white, brown, or red in color. Option A, buildup of moisture in the epidermis, may lead to other skin conditions such as eczema or fungal infections, but it is not the main cause of keratosis. Option B, inflammation of the skin, can occur in response to many different factors, but it is not the direct cause of keratosis. Similarly, option D, loss of skin elasticity, is a common symptom of aging but it is not the underlying cause of keratosis. This condition is primarily caused by the buildup of skin cells, and understanding this can help in the prevention and treatment of keratosis.