Fuller Beard
A: Facial hair grows in much the same basic way as the hair on your head, although the two types of hair have some biological differences. Facial hair tends to be coarser in texture, flatter in shape, and often more curly than scalp hair. The rate at which it grows can vary considerably from person to person.
Genetics, Hormones, and Age
The fullness of your beard is determined largely by genetics, age, and the way your individual hair follicles respond to androgens, specifically testosterone and dihydrotestosterone (DHT). There isn't anything that can be done through ordinary grooming to increase the number of hair follicles on your face.In most cases, a sparse beard is simply a matter of genetics and age. Young men develop facial hair at very different rates. Some young men need to shave daily by the time they are a senior in high school, while others reach their mid-twenties without being able to grow much facial hair. Facial hair can continue to become thicker and more noticeable through the late teens and twenties, and sometimes beyond.
Medical Conditions and Treatments
If you have a specific condition that is causing abnormal hair growth or an abnormal lack of hair, though, treatment of that condition may improve things. If you suspect abnormal hair loss or growth, you should see a doctor to determine its cause.There are medical treatments that may increase facial hair growth. Topical minoxidil, for example, has been shown in clinical trials to increase facial hair density and shaft diameter by extending the hair follicle's growth phase. However, using minoxidil on the face is an off-label use and isn't guaranteed to work for everyone.
Minoxidil can cause side effects like facial skin irritation, dryness, unwanted hair growth elsewhere, or systemic effects like low blood pressure and a rapid heartbeat. It is also toxic to household pets like cats and dogs. If you're considering it, it is best to discuss it with a doctor first rather than assuming a product designed for the scalp is automatically safe for your face.
Styling and Grooming Strategies
Practically speaking, the best approach right now is to find a beard style that flatters the growth you currently have. Letting sparse areas grow longer can sometimes make the beard appear fuller because longer hairs overlap and can cover bare skin.If you prefer a well-groomed look and are concerned that extra length will make the facial hair appear too bushy, you can always use a little pomade or another beard-styling product and a brush to give a smoother, more closely groomed appearance.
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See also:
How fast do all areas of facial hair grow?
Beards and the shape of your face
Basic styles for moustaches and beards