Incisional Eyelid Surgery with Non Absorbale suture
I do not know what exact procedure you have had based on your question, but asking your surgeon to look at and remove the suture if necessary would be my suggestion
It is also normal for non absorbable sutures that were once buried to become exposed. This stitch needs to be removed. See your surgeon for this or find an ophthalmologist to assist you will the removal of the offending suture. The other questions really can't be answered in a meaningful way without a detailed consultation.