Had a genetic testing at mayo due toinactive brain tumor&neuralgia. I now have a lump on my lower spine and over my left knee. Is this nf1.I have no ins?

Unknown. Without knowing the other characteristics of your physical exam and the results of genetic testing, it is impossible to determine your genotype. As you went to Mayo Clinic, and had genetic testing performed, you should probably follow up with them and their genetic counselors to go over your results.