Those white things are tubular and covered with hair. They are substances called hairclippers, but they are not real worms. It is caused by long-term tight hair.

A caterpillar is a piece of white material that grows on the hair, that is, white objects similar to dandruff often appear on the hair. This little thing usually appears at a distance of 1cm-2cm from the hair root, and wraps the hair in a tubular shape, with a length of about 1mm-2mm, which tightly surrounds the hair and is usually easily broken from here when shampooing or combing the hair.