I am 22 years old male. I have lots of vellus hairs all over my face (beard region). The hairs on my moustache, chin ,sideburns are terminal and thick. But the hairs on cheeks and neck are very light and not even pigmented. I see slow change in them. What is the region behind it? Will they surely become terminal so that I could have an even facial hair growth? What are the ways by which I can make them turn terminal faster?