This looks like Roseola Rash. Does he also have fever ? It is mainly caused due to a herpes virus so you might want to take your son to the doctor. Also give him a lot of fluids and sponge baths. It will disappear in 2-3 days. there is no particular treatment for it but the doctor might prescribe some antibiotics
Promo terbesar expert care sudah dimulai, diskon hingga Rp.100.000 sedang berlangsung di shopee, ada juga voucher diskon 100% alias gratis bagi bunda yang beruntung. Buruan cek di https://shope.ee/9UfEMMqqTg (id-452)
thanks