Lack of 'sufficient ' beard growth can because of genetic reasons. By genetic I mean, that which starts from the self ...heredity can also be a factory, and by heredity I mean that you have inherited the bread pattern from your family. Other than this , various hormonal imbalances can cause such problems. My suggestion is that you visit an allopathic dermatologist near you . Only after a thorough examination will a dermatologist be able to tell you the reason for your beard growth pattern and treat you accordingly if there is a pathology involved.