What can I do to grow thicker facial hair?

sir this problem is not by my genetic or hereditary,,,cos my father, grand father,,uncles,brother have full face beard,,,but I don't have full beard,,,sir I have alargy in my body+I am unhealthy, 2years ago I faced this alargy problem also I faced hair falling problem then a dermatologist said that my scalp attacks by fungus,,then he gave me some tablets and some anti fungus drops thats it, bt till now the problem don't gone away,,plzz give me suggestion for getting full face beard of mine.

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