Photo of young man showing 1 month change on finasteride but not real (from Reddit)
https://healthell.blogspot.com/2019/05/photo-of-young-man-showing-1-month.html
The hair is longer so the impact I believe we are seeing is due to longer hair. Hair grows about 1/2 inch per month so if the December photos has a 1/2 inch of length and the January photos (30 days later) and 1 inch of length, the hair mass will have doubled.
from BaldingBlog - Hair Loss Info http://bit.ly/2VUKX0k