Milia under my child's eyes ㅠㅜ

My 10-year-old daughter has several white spots under her eyes that look like millet seeds, and I'm worried. Could they be milia?

Adults say it's a sebaceous cyst, but why do they appear?

I wonder if this needs laser treatment or if there is an ointment or something... My child is scared so I can't take him to the hospital ㅠㅠ

It's bothering me that there are several small ones growing all over the place instead of just one. Please tell me how to prevent sebaceous cysts!♡

Please also tell me that children should wash their faces with foam cleanser after applying sunscreen!!