What is this roll below my butt cheek? (Photos)

The area on your right thigh is called a “Banana roll”.   They can be asymmetric or symmetric. The treatment would involve debulking of this area with either liposuction or noninvasive procedures such as cool sculpting. I recommend that you seek the advice of a board certified plastic surgeon in your area. 

Based on the photos provided, I would likely discuss a non-surgical option with my patient such as Cool Sculpting. It looks like it's unilateral and would probably be treated with 1 to 3 Cool Sculpting applications. The treatment is relatively painless, with little or no down time and is a cost effective option verses liposuction.Cool Sculpting is a non surgical option to remove fat cells. An applicator is applied to the area freezing the fat cells to a temperature where the fat cells die but the skin is unharmed. The treatment is approximately 35 minutes in duration and patients have no restrictions following the treatment. The will continue to eliminate the dead fat cells for months following treatment. Most patients see results after 3 weeks and can continue to see results from 3 to 4 months following treatment. 

Thank  you for your question and providing images. You look to be an excellent candidate for CoolSculpting, a non-invasive fat reduction technique, used to treat localized areas such as the "banana roll" you are bothered by. I would recommend scheduling a consultation with a Board Certified Surgeon in your area to discuss possible treatment. Good luck!

I don't know if this is relevant to your case but I have seen this once before in someone with uneven leg length. If it goes away with a book of appropriate thickness under 1 foot then you will need to obtain appropriate shoes to prevent future hip and back pain.

Hello,Thank you for sharing the information, it is a pleasure for me to answer your question.It is difficult to evaluate the options without seeing photos, Definitely the most appropriate is to start (liposuction and BBL can also be included), you are a candidate perfect, for the procedure, with this you can eliminate all localized fat and flaccidity, you will get the best results and have a defined appearance according to your body.
It is advisable to consult with a certified plastic surgeon, for a goodevaluation, to provide you with all the information you need to know about the appropriate recommendations, so that you can achieve the desired goals in your body.
I hope this answer will help youMy best wishes for you...