Such hair can be removed by a process called electrolysis. This process, in which the papillae are destroyed by an electric needle, prevents new hair from growing. Unwanted hair above the surface of the skin can be removed by the application of a liquid or paste that is called a depilatory. However, the root of the hair stays alive, and so the hair grows out again. Other scalp disorders include dandruff, ringworm, and head lice.
Dandruff consists of scales of skin that fall from the scalp.
It does not cause hair loss unless accompanied by an infection severe enough to damage the follicles. Ringworm is an infection caused by tiny organisms called fungi, which feed on the keratin. The hairs break off, leaving bare areas on the scalp. Head lice are insects that suck blood from the scalp and attach their eggs to hairs. How to cite this article.