Actinic keratosis

Actinic keratosis: symptoms In the early stages, it is not easy for laypeople to recognize actinic keratosis: In one or more places, there is initially a sharply defined reddening that feels like fine sandpaper. Later, the horny layer thickens and thick, sometimes yellowish-brown horny deposits form. Their diameter can range from a few millimeters to … What is actinic keratosis?