Hi. Face Gua Sha is not painful at all.
It helps you to detox and relax.
I did Gua Sha followed by a Facial a few times and I snooze off for 10-15mins each time.
The dark eye rings will lighten 5%, definitely, face will brighten throughout the day.
The place I go is at Bukit Merah Central, Level 2 (above 7-11). Very good skills by this china lady boss. Her name is Apple.
Of course, the effects are not permanent .. You will need to take care as well.