Working out the cause. Nail varnish is one of the most common causes. After painting your nails, the varnish will give off tiny amounts of chemical vapour for a while, even when it feels dry. If you rub your eye, the eyelid skin may react. Artificial nails can cause a similar eyelid reaction.
The PCL (posterior cruciate ligament) is the strongest ligament, or band of tissue, in your knee. It stretches across the back of your knee. It connects your shinbone to your thigh bone and keeps your knee stable. A sharp, violent blow to the knee can stretch or tear your PCL. That can make it hard for you to get around.
Ulnar Collateral Ligament (UCL) Injuries of the Elbow. Ulnar Collateral Ligament (UCL) Injuries of the Elbow: What You Need to Know. The ulnar collateral ligament is most often injured by repeated stress on the ligament from overhead or throwing movement. A symptom of ulnar collateral ligament injury is pain on the inside of the elbow.