Hello,There is lot of variation of hair growth in different races and individuals.Also the variation extends to various ares even in the individual.For example growth of hairs on the pinna of the ears is obvious in the singalese,and bengalis of india.Mongoloid races show less body hair.
The inheritence pattern of these variations are poorly understood while the patterns are recognized.
It is unlikely that one could speed up growth in these specific areas.
Dr.M.Jagesh kamath MBBS. Dvd Consultant dermatologist