Is this Ptosis or a Swollen Eyelid? (photo)

I went to a Doctor who told me I have Blepharitis and the second doctor said the same as well. But I asked both of them why one of my eyes look droopy/swollen and they said once the Blephritis goes so will the swelling. But why is it in one eye when I have Blepharitis in both? I feel like I have acquired ptosis, my eyes were fine 1.4 years ago! And my ptosis eye hurts also, 24/7. I wear glasses to somewhat ease the pain and irritation. I feel like no one can figure out what's wrong w/ my eye!!