Keratosis refers to a condition in which there is an abnormal growth or thickening of skin cells. This can manifest as a variety of skin lesions, including patches of dry, scaly skin (ichthyosis), raised bumps (papules) or plaques (plaque-like keratinocytes). Keratosis can be caused by various factors such as genetics, environmental factors, and underlying medical conditions. Treatment may involve topical medications, corticosteroid injections, or surgery depending on the severity of the condition.