I have purple streaks and blotches around my testicles what can cause this
Hello,
From what you have described, it sounds like stretch marks. Stretch marks can appear when there is rapid stretching of the skin. It is common in rapid gaining or losing of weight, puberty,cushings syndrome and overuse of steroids. Laser therapy, and dermabrasion, alone or in combination have also been shown to be effective in diminishing the appearance of stretch marks.
It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.