both of my daughters had those little lumps on the back of their necks, I freaked out with my first born of course. Theyre very common and will go away on their own, they dont seem to cause any discomfort. As for the cradle cap, thats the first time i ever heard of it as a virus?!?! so wierd, anyways, if u dont know already, gemtly warm olive oil in the microwave, massage into babys scalp, let sit 5-10 mins then gently scape scalp with fine tooth baby comb for 5 minutes at least, it will feel marvelous for that babys ithcy scalp and most of the "scabbing" will come of, you may need to repeat 2 or 3 times, but that should do it, good luck!