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.
Where is your LCL? The LCL ligament is found along the outside of the knee and connects the femur to the smaller bone of the leg bone (fibula). The LCL along with the MCL are both collateral ligaments meaning they are found along the sides of the knee. The LCL controls the side to side movement within the knee. Since the LCL does not connect to the meniscus or knee joint capsule, it is more flexible, and less vulnerable to knee injuries. An LCL injury is however very common in contact sports such as football and soccer.