It Can be due to neuralgia or even fibromyalgia can cause tactile allodynia( pain on touch). I suggest you to consult a physician and get it evaluated. Since there is no rash as such, a biopsy of the skin can help in diagnosis.
It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.