N.S.
I don't want to make you crazy but I will tell you what happened to my daughter a little older than 5 months. I scratched her subtly (accidentally) not thinking that it would last or scar and I put aloe on as well. I also put on vitamin E and I was diligent about it. Nonetheless it scarred. It was not in such a noticeable place but until recently the indentation of the scratch was still there. It is barely noticeable now over 1 1/2 yrs. later. I think it'll go away with time and I'm sure your son's will too since their skin is so resilient when its so young and soft. But for ages we saw it in pictures of her and I felt HORRIBLE to have caused that to her. It is hard to know what to put on it but you could call a dermatologist and ask if there is something stronger to put on it so it'll heal. I would only go with something all natural though, no steroidal lotions.