thanks for your link. I went through it. However, it seems that such a condition is caused by a single worm under the skin especially in the face/neck region while this kitten had hundreds coming out simultaneously from within the skin of his hips. They were not more than 1mm in length each and had a creammy white colour. They were also coming out from within the ears and some also from his mouth. There was no reddening or blood coming out of the kitten's skin/ears or mouth but from how he was opening his mouth and how lethargic he was compared to his siblings, I think they caused quite a lot of discomfort
The thing I thought most plausible is that the mother cat has something wrong (maybe a worm laying eggs in her which attck the unborn babies) or I don't know what to think. I mean, how could a fly deposit eggs in a newborn kitty and they hatch and get out of the skin by the next day?
Thanks again for your post, it is always useful to learn about such things.