When you shower you’re supposed to vigorous rub your scalp with your finger tips. Some people don’t get taught how to do it.
[EDIT: P.S I once got rid of a psoriasis like skin irritation by giving it an even cover of yakult three times a day (once in the morning, once at lunch time, and once before bed). My theory on why this worked is that it reset the biome whilst forming a protective shell that deprived oxygen to the effected area.]
Unfortunately the technology will also be used for creating new weapons of war.