Why do styes occur? ㅠ

Having three children, the stye is the youngest one's first time.

My 13-year-old older child has never had a stye, but my 4-year-old youngest has already had three styes. ㅠ

The pediatrician I visited initially asked if I had frequently had styes before.

At that time, I only casually said no, or just that it was the first time...

After getting a stye for the third time this time, I started to wonder if those who get it frequently have some underlying reason.

The first and second ones easily took the medicine and settled down.

This time, even medication couldn't make it go down, so in the end, I took medicine for ten days, and it finally burst on its own;;;

I was worried because the hospital didn't perform local anesthesia for the tear, but I guess it's fortunate that it burst on its own;;

Anyway, it seems it will take quite a while longer for the swelling to go down.

This is already my third stye, and this time it was so severe that it took a long time to heal.

I'm really curious about why this is happening,ㅠ.

I went through a lot this time and I don't want to get sick again, but I'm worried it might relapse.