Itchy Eye Strings Why Is My Bottom Eye Lid Itchy And A Little Swollen?

Why is my bottom eye lid itchy and a little swollen? - itchy eye strings

My left eye started itching and bloodshot little, there is also a swelling goes. What could that be? Two days ago I woke up and my right eye was swollen for some reason, the only strange that this happens. Any help would be great. Thanks