DHT is an androgen which is 3 to 5 times as effective in producing male secondary sex characteristics as free testosterone. Within the body, a proportion (not sure if it's the majority or the minority) of injected T is converted into DHT. DHT will increase the growth of the clitoris. If your hair follicles are sensitive to it, DHT is also what makes you go bald. Pseudo-hermphroditic men (who usually identify as women and are only technically "men" by their XY chromsomes) lack the enzyme which converts free T to DHT, so they do not go bald or grow much facial hair, and their penis is usually stunted in size (sometimes to the point of looking like a large clitoris).