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.
As with any other sprain, a MCL injury is the result of excessive stretching or tearing of the ligament. The severity of the injury can range from a slight stretching to a complete rupture of the ligament.earn the Causes of an MCL Tear, plus Prevention and Treatment Strategies. MCL tear, or MCL sprain, is another common knee injury, which typically affects athletes involved in contact sports, such as football, gridiron and soccer. MCL tear and MCL sprain are commonly referred to as a Medial Collateral Ligament Injury.