Parasthesia is due to dysfunctioning of neurons. It can be due to
diabetes, hypothyroidism, peripheral vascular disease, vitamin B12 deficiency, neujrological causes or malnutrition.
Get your blood sugar and thyroid hormones levels evaluated. You can take some vit B12 for some days and see if the symptoms improve. If the symptoms persist then get the above mentioned possibilities ruled out from a neurologist.