Thank you for uploading the picture.
Yes,I have got the picture via email by the moderators.I have seen your picture closely.
The white sac seen in the picture seems most probably due to wart.Also the possibility of fungal infection should be ruled out.Also this can be a nodule or a polyp.
Although there does not seem to be anything serious about this white sac.Treatment can only be done after confirmation of exact cause.
Again,avoid actions that strain the vocal cords such as whispering, shouting, crying, and singing.
Exact diagnosis can only be made after physical & clinicalexamination.So I advice you to make an appointment with your doctor for thesetests & examination to know the exact cause & then treatment will bedone accordingly.Also please do not forget to rate my answer as this is the only way by which an expert can get credit for his work.My main motive is your satisfaction.If you still have any questions in mind,please feel free to ask.
Thank you for using just answer website.
Kind Regards- Dr Charles