What Causes Swelling On Eyelid?

I had alot of pain on my eyelid for an entire day with a little round bump on the edge of the eyelid, thinking it was a sty about to happen, I didn't seek medical attention, the next day and four days later, my eyelid was completely swollen. I used erythromicin opthmalic ointment and the swelling went down, and after six days it finally looks mostly normal, with the exception of a very small bump. Should I still go to a doctor, being that I later found a large strrange looking long legged spider near my bed?