It is a kind of rheumatics complaint. There are 84 different types of rheumatics complaints as per Ayurveda. In that one disease named "Kranthasi (Sanskrit Word)" is the disease name of yours. Due to nerve
weakness that results in slow spreading of blood flow to those particular part creates these sorts of problems. So this is likely to continue unless you consult a doctor soon and cure it.
Thank you very much
Dr. A. Abdul Rahim R.H.M.P.I.M.P