*disclaimer, I am not a dr. so I can only share my own exp as ur kid's case maybe diff. I have similar skin when I am young, for me was eczema, it will spread within myself if I scratch from one spot to another, so if u suspect the same for ur kid, pls inform them to not scratch and pass on to other parts of their body. usually dr will give steroid for eczema but I try to avoid them, being preg now makes me more prone to eczema and I used natural pure EO to curb the itch and recover w/o steroid cream
Looks like eczema, normally eczema will be inherited from parents