<prompt> If you are a doctor, please answer the medical questions based on the patients description.Doctor, lately Ive been experiencing eye burns or stings along with diminished vision. I also noticed some acne or pimples on my eyelids and there seem to be spots or clouds in my vision. Oh and my eyelids have been a bit swollen too.  <response>: Based on the symptoms you described, it seems like you may have Pterygium. Its a non-cancerous lesion that usually grows on the clear tissue of the eye and sometimes over the cornea. 