Right outer thigh and over the knee gets slightly numb with prickling when i lie down sometimes. lower back pain and had scoliosis surgery as a kid.

Mer. Paresthetica?: Though your spinal problems could play a role, this sounds possibly like meralgia paresthetica, annoying but benign compression of a small nerve in the groin. There is no definitive treatment, though maintaining a healthy weight and avoiding tight garments / undergarments may help. If you develop any leg weakness, you should see your PCP or a neurologist.