Boy moms, I need your help!!!

So I was giving my 2 year old nephew a bath tonight and noticed that he had a piece of his diaper or something on the end of his penis. When I tried drying him off he acted super weird and would tighten his legs up and wouldn’t let anything near that area.

When I was about to dry him off I asked him if he was okay and he told me he hurt. I asked him where it hurt and he tried to point to that area. I told me sister that he said something about hurting but she didn’t really look or seem too worried.

Should I press the issue and tell her she might want to check him out? He repeats every single thing that anybody says to him so I didn’t want to ask him anything where he could answer just by repeating me