snake oil sellers say their product helps hair to grow by unclogging
pores and allowing the hair follicle to "breathe". Apparently
the claim is that hair follicles need exposure to air in order to
grow hair. Hair follicles so not need exposure to air. Hair follicles
receive their nutrients and oxygen entirely from the blood stream
as does any other living body tissue.
In some experimental research procedures hair follicles have been
transplanted to internal areas of the body such as into the kidney.
The hair follicles successfully grew without the need for any exposure
to the skin surface.