Why Do Men Lose Patches Of Hair On Their Lower Legs?

Best answer I can find so far.  This affects many men as they age and extends up to the knee and sometimes beyond.  Thought to be a lower level of testosterone but it appears that ...It’s not the lower level of testosterone per se that causes the hair loss. Testosterone is broken down by an enzyme, 5-alpha reductase, to form dihydrotestosterone (DHT). It is an excess of DHT that actually causes the hair loss, not the deficiency of testosterone.
Progesterone acts as an inhibitor of 5-alpha reductase, but older men experience a reduction in progesterone levels. This in turn cause increased 5-alpha reductase activity, which causes in increase in DHT, which shuts down follicles. Whew!

It's always seeming to be at sock level - I think that dress socks have a habit of pulling out leg hair and bet that for men who usually don't wear dress socks don't suffer the same problem.  Just a thought...could be complete coincidence.

Could be either loss of, or you have more than usual testosterone.  The body is a funny thing, with estrogen, me being a woman, we start to grow mustaches, many or us, thank goodness I'm fair, and the hair on my legs are thinking out, My mom is a redhead, never had hair on her legs

Total leg hair loss men