I have periferal neuropathy in my lower legs, but now i have muscular atrophy in my upper legs, what can i do about the atrophy?

Determine cause: Before you can embark on a treatment plan you need to determine the cause of the peripheral neuropathy. As there are many causes of neuropathy, you should see a neurologist who specializes in nerve and muscle diseases. There are some common causes, diabetes mellitus and nutritional deficiencies and very esoteric causes that may require a biopsy. But until you know cause you can't start treatment.

Have it evaluated.: Nerve damage can cause atrophy. One must determine the cause of the damage in order to decide on what will be the best treatment.

Some reasons:: Sounds like a fairly progressive problem which needs to be clearly diagnosed. You could possess an immune inflammatory neuropathy which could readily respond to ivig, or you might have a motor neuron disorder, or you might possess a cauda equine syndrome, instead of a neuropathy. In short, this needs concerted expert attention. See a neuromuscular specialist at your nearby medical school.