bulging eye

I recently noticed that siris left eye is sticking out more than her right one. I researched into it and many sources say it could be a tumour behind her eye? I’ve experienced many other piggy eye problems before but not this. Advice and tips would be greatly appreciated!

My skinny pig is 10 months old. He had an ear infection and strep throat the beginning of November and he was on an antibiotics for 2 weeks. He's eating, drinking water, chirping and seems like his old self but his head is still tilted and one eye is swollen or one eye is bigger than the other...