[Purchased with my own money] Powder brush

I bought this brush because someone told me that using it makes applying powder look more natural and is less harsh on the skin. Although it is made of synthetic bristles, it felt very soft to the touch at Olive Young. Since I tend to apply powder very haphazardly—barely touching the skin—I didn't think much of it. I thought it stung a little, but it didn't bother me. However, after a month, my face became sensitive, and it stung terribly. I am not picky about makeup tools, so I also use brushes made by brands like The Face Shop and Innisfree without any issues.