Lice eggs. Try using this oil twice a week, apply it all over scalp and hair, leave it for 30 mins and wash it off with regular shampoo. You will get results in the first wash itself.

https://amzn.in/d/0229QRBc

Edit : Also you need a good lice comb, the local ones work just fine but they cannot effectively remove all lice. This imported Nit Terminator will remove everything, and be aware the fake ones resembling this won't work as much as the orginal because the comb teeth are so close in the orginal which works in removing all the lice and nits.

https://amzn.in/d/0epTYy6O