Curing male pattern baldness or deliberately triggering it on other parts of the body is a puzzle science has been trying to solve for a long time

cross section of hair

• The cuticle is composed of layers of thin flat cells that look like roof shingles
• The cortex contains the long thin strands of Keratin
• The medulla is a loose and often open area at the centre of the hair.

Hair colour is derived from the same pigment as skin colour: melanin. There are 2 types of melanin in human hair: eumelanin and pheomelanin. Eumelanin is either black or brown but is largely responsible for the lightness or darkness of hair. Pheomelanin is either orange or yellow and responsible for the subtle variety in hair colours. Blonde hair is not caused by any particular combination of the melanin types but simply from having very low levels of melanin in the hair.

Hair Types

Although hair on different parts of our bodies appears to be quite different this is simply to do with density and growth rate. Under a microscope, only 2 types of hair are identifiable: Terminal hair and Vellus hair. Terminal hair is the thick stranded coloured hair concentrated most densely on the head while vellus hair is the colourless down you will find growing on almost the entire body other than hands, feet and lips. When we are newly born almost all our hair, even on our heads, is vellus hair. Over time, growth and sex hormones cause vellus hair follicles to switch to producing terminal hair and eventually the male and female patterns of body hair.

Terminal hair follicles will never switch back to producing vellus hair once this change has been triggered so we are stuck with any terminal hair we acquire. The one mysterious exception to this is male pattern baldness. Curing male pattern baldness or deliberately triggering it on other parts of the body is a puzzle science has been trying to solve for a long time.

http://permanence.com.au/about-electrolysis-2/how-hair-grows/