What can be done about numbness on the bottom of my feet?

PN: Sounds like you may have peripheral neuropathy, a type of nerve damage, which typically feels like numbness, tingling or burning in your hands and/or feet. Peripheral neuropathy can result from problems such as injuries, infections, diabetes, metabolic problems, medications, and vitamin B12 deficiency. There are many medications available for this condition. Get evaluated by your doctor!

Internal issue: Numbness that involves both feet either the tops or bottom or both, is a systemic issue. Meaning, it's something that your body is doing to you. If it's not going to be back related it will be a metabolic disorder. Possible diabetes or others. You need to start with an internist and they will start with bloodwork. If you have a back issue, be sure to relay this to the internist.

Depends on the cause: Numbness can occur from various reasons. Some potential causes include vitamin deficiency, nerve damage, nerve compression, alcohol over consumption, side effects of different medications, or as a result of different systemic medical conditions such as diabetes. Get evaluated by a professional to determine the diagnosis. Treatment is based on the diagnosis.