Sticky spots on pan

Hi! I'm an amateur and must have used my pan incorrectly, and would like to ask some directions to fix my specific case.

Once after cooking with it I washed it with hot water, dried it, and put it on the oven to make sure its completely dry. I added some oil too. Unfortunatelly I forgot about it, and came back when it was already smoking, and having that huge spot on the right side of the image. The pan wasn't completely on a flat surface, so most of the oil flowed on the right side. Also a lump of oil(?) formed at the bottom of the spot, which I could remove with hot water, and non-metal scrubber.

I tried searching online for a solution, but I'm not 100% sure what this exact case is, and which solution to try.

How could I fix my pan? Thans in advance!