Hair is a natural byproduct of growth, and if you maintain your health and exercise with some regularity, your hair should grow in all by itself. However, bacterial growth and a build-up of oils can sometimes plug your hair follicles, keeping the hair from growing out. When that happens, you need to clean your hair follicles, so that your hair can grow in the way it was meant to.
Dip your comb into apple cider vinegar and comb your hair. This vinegar helps eat away at bacterial growth, and you will be running the comb -- as well as the vinegar -- along your scalp to increase blood flow. This will speed your body's delivery of nutrients to your scalp. Comb your hair this way, until the hair is saturated with the vinegar, and allow it to sit for 15 minutes before washing it out.
Use coal tar shampoo, or a similar product that is geared toward reducing bacteria and cleaning your hair follicles. The build-up of oils and bacteria, already loosened by the exposure to vinegar and the combing will be loosened and washed away, as the coal tar shampoo reaches into your scalp and washes out the follicles.
Vigorously massage the shampoo into your scalp for 3 to 5 minutes, before washing it out in the shower. Do not use two doses of this shampoo at once, and always wash your hands thoroughly once you're finished with it.
Avoid using hair products, shampoos or conditioners that use excessive sebum. This material can help contribute to your clogged follicles. Additionally shampoos that are made from natural ingredients, according to Free Diabete, are much less likely to plug your follicles in the first place. Cleaning out the follicles is one thing, but keeping them clean is necessary too.
As your skin improves you can switch from harsher cleaners like coal tar shampoo to more standard, follicle cleansing or deep cleaning shampoos. These will help you maintain open follicles when you don't have a clog that requires heavier cleaners.