My eyelid is red, and my eyes are bloodshot. Is this due to the contact lens?

Hi doctor,

I have struggled with my right eye, where I have had a red eyelid around the eye, and my eyeball would be bloodshot. I did scratch my eye two years ago, and that was the cause and got infected. I have gone to the doctors and told me to stop wearing contacts and put me on antibiotic drops and cream. It worked, but then my eyeball would still be bloodshot a month later on a random day. I eventually tried this eye drop for pink eye, and it cleared up my vision very well. I went to my regular eye doctor, and he said that my eyesight was cleared up, and everything looked good, so I can go back to contacts. I wear contact lenses all summer, and my eye was perfectly fine till three months ago. Suddenly, I woke up in the morning after a 40-degree night of work with my right eye back to bloodshot with the cold weather coming in. Now I am frustrated and do not understand what happened because it was perfectly fine all summer. I need help.