Actinic keratosis. Overview. Actinic keratosis Actinic keratoses are scaly spots or patches on the top layer of skin. With time the spots or patches may become hard with a wart-like surface. An actinic keratosis (ak-TIN-ik ker-uh-TOE-sis) is a rough, scaly patch on your skin that develops from years of exposure to the sun. It's most commonly found on your face, lips, ears, back of your hands, forearms, scalp or neck.
Elbow bursitis, also called olecranon bursitis, causes fluid to collect in a sac that lies behind the elbow, called the olecranon bursa. Elbow bursitis is the most common type of bursitis. A bursa is a slippery, sac-like tissue that normally allows smooth movement around bony prominences, such as the point behind the elbow. When a bursa becomes inflamed, the sac fills with fluid. This can cause pain and a noticeable swelling behind the elbow. The olecranon bursa measures up to 6 cm in length, and can swell to a size larger than a golf ball. Elbow bursitis may follow a traumatic accident, such as a falling on the back of the elbow, or it may seemingly pop up out of nowhere.
Causes. Your elbow can start swelling for several reasons: Trauma: A hard blow to the elbow such as hitting it or falling on top of it could cause the bursa to swell. Too much pressure: Leaning your elbow against a hard surface over a long time can irritate the bursa.