how do you know if the shedding is from rogaine or propecia?

[threats77]

ive been shedding since late october with no signs of ending...ive been on foam since july and propecia since june..so 5 months on foam and 6 months on propecia..is there anyway to tell which the shed is from? just curious..and how long is a typical shed last? quite annoying..but i gotta stick it out

 

[RaginDemon]

if you are using both, you can't determine which caused the shedding.