The picture is not very clear. From the photo, it should be a local bulge in the middle and back of the left vocal cord, and vocal cord cyst is not ruled out. Suggest reviewing.

(Dr. Li Jiping from Yan Chai Hospital solemnly reminds me that because I can't meet the patient face to face, I can't fully understand the condition. The above suggestions are for reference only. Please go to the hospital for specific diagnosis and treatment under the guidance of a doctor! )