How effective is this treatment for someone with a bald spot in the back of the head?

The design of the REVIAN cap completely covers the front of your head, side of hairline, the back and adjusts to fit a wide range of head sizes. It will cover the middle of the head without any problems.
It will cover bald spots and is designed to cover the entire head. The cap will cover bald spots. Unlike other plastic helmets using lasers, LEDs put off a much wider angle of light, bathing the entire scalp in overlapping cones of light. Laser products are much more tightly focused and only hit certain places on your scalp.