User blog comment:The Six-Fingered One/The Psycho Series -- and My Thoughts On It/@comment-5100783-20160531180037

This may be a stretch, but I think Jesse's hair may also be a plot device, as stupid as that sounds.

Think about it. Earlier on in the Psycho Series, Jesse has neatly-combed hair for the majority of July 2014-February 2015, with the exception of Psycho Brother Clips Head. During this time, Jeff Sr. is barely starting to lose his control of his anger, Jesse is much more uplifting and happy, Theresa is still in the house, etc. As the hair grows, Jesse's life and family gradually disintegrates along with it. By the time his hair flows all the way down his back into curls and tangles however, Jesse descends into madness, Theresa is gone for good, Jeff Jr. is moved out, Jeff Sr. is outright psychotic, Larry is laying on a semi-death bed, and Jesse's filming is constrained to a closet.

The hair's growth represents Jesse's madness and his sanity spiraling out of control. As the hair curls and tangles, so do more aspects of Jesse's life.