A cotton swab is a short spindle with one or both ends coated with an absorbent cotton padding. Such swabs have been used for various cosmetic and personal hygiene tasks, particularly for cleaning the ear.

However,in most cases, the swabs were used for cleaning, but as this study shows that accidents typically occurred when kids were using the cotton swabs.
We all know that you're not supposed to clean your ears with cotton swab. And yet, people still do it all the time.
But do you really know what's the trouble about cleaning ear with cotton swab?
The most basic problem is that using cotton swab is probably doing the opposite of what it’s supposed to do. You plan to get earwax out, but you may just pack it deeper in there,which can plug up your ear canal or can interfere with your hearing.It means you can get buzzing in the ear.
Since no matter what we say, you’re going to keep cleaning your ears with cotton swabs,but you must to do one thing:be gentle. That soft cotton tip can leave grooves and scratches in the fragile skin.