Check out Neuro-Cutaneous-Syndrome. NCS. I have come to believe that heavy metal and other environmental toxins are lowering our immune systems so that we cannot fight parasite intrusions into our bodies. Bacterial infections and toxins can cause gut and brain, body enflammation, which often manifest in pin prick and biting sensations as well as a crawling feeling. Coupled with dermal and subdermal parasitic infections that also cause crawling, biting, itchy feelings. Symptoms can vary from person to person depending on immune system strength or rather weakness. Must detoxify to raise immune response level while treating the parasitic condition(s). I am searching for better and less expensive treatments that have not been taken control of by the phonyFDA and removed from the market. My sister is afflicted with heavy metals and parasites both and has been suffering for a year and a half. Fatigue, pin pricking and itching sensations along with crawling feelings, vision trouble, enflammation of her feet, and slight cognitive dysfunction, blepharitus, folliculitus and she still has signs of what seem to be collumbola or cheylatia mites which very, very small and live dermal and subdermal. She had tests done by Metametrix that showed she had dental toxicity as well and had all of her toxic dental amalgams(mostly silver-mercury fillings) removed and replaced with something that is supposed to be non-toxic> Best wishes for your recovery.