why do parts of our body die?

It seems to me that the “supply chain” is beeing interrupted…

The male sex characteristics start to die after discontinuation of finasteride…

  • the facial bone structure, thick facial bones are a manly trait
  • skin, thick skin is a manly trait
  • penis tissure, obviously manly
  • (muscle), also manly

This seems to be key of PFS… does anyone have an explaination to why the manly parts of our bodies “die”? Do you think they can be grown again, or do i need a second puberty?