What causes the red/purple splotches and occassional numbness on my legs?!?

My legs seem to always be very splotchy and red all over, and my knee caps get an obvious splotchy red/purple tone with occasional numbness. Even in the summer heat, my legs get like this (including the numbness). It sounds like a circulation problem but i can not get any answers from internet sites or doctors. I do take the ADHD medication, Adderall, and i am thinking that might be a reason, but i dont know. If anyone has any ideas, please let me know because I am extremely tired of dealing with this and the embarressment of gross looking legs. thanks!

It’s bad circulation…….It happens to me all the time and all you can do is try to eat right, excercize, and keep going to doctor visits. The numbness sounds like a nerve being pinched.