Hi. Sorry for the delay
Any rash or redness associated with this?
OK--we can continue after this if you'd like.
I don't think this is a skin nor a dermatologic problem if there's no rash.
This sounds like a neuropathy--an inflamed or irritated nerve problem.
While it could be from a disk problem in your lumbar spine it could also be from a more systemic problem like diabetes, magnesium or vitamin B12 deficiency, or perhaps an autoimmune neuralgia condition.
I suggest you ask your doctor for an MRI of your lumbar spine and get blood work to check for the other possibilities. And one doesn't have to have back pain to have symptoms from a herniated disk.