Aren't they suppose to stitch, drain hole from the Tummy Tuck after they pull it out of the body?

It isn't necessary to stitch close the incisions where the drains are inserted because they are very small and heal well on their own. Normally, they are dressed with a bandage and in a bit they will close on their own. Just make sure to keep the are clean and not submerge yourself in a bath while they heal.

Drain holes will close on their own and don't need suturing. It will usually seal in a few days and have a scab that will come off within a few weeks.

Your darin stitch is NOT supposed to be stitched, and if the drainage stops it should close up within 24-48 hours, and be healed within a week. The final scar will take at least a year to look the way it will look long term. 

We do not stitch the drain holes closed because that would actually increase your chance of infection.  The heal by secondary intention in about 4-5 days

Thank you for your question.  It is normal to remove the drain and leave the hole open.  I usually put a little antibiotic ointment on it and gauze after the removal of the drain.  They do heal and close on there own nicely. Follow your Plastic Surgeons wound care instructions.  If you have concerns I would recommend following up with your plastic surgeon.  Best of Luck.