Can Cradle Cap come back?

Stacey • One boy, one girl, Two in Heaven and another on the way. Endo Warrior, Bicornuate Uterus

So my boy will be 2 in January. Tonight after his bath I could not find his brush which is a soft brush so I used his comb and as I was combing I noticed resistance. I look and all this gunk was coming up along with his hair! It looks like cradle cap but more oily....like I can not pull it out of his hair. Any advice? I feel so bad I never noticed but like I said I usually soft brush. This is only happening at thee top of his head.