HI Thank for asking to HCM This could be tactile hallucination, a kind of psychological condition, for that you better go to consult some good psychiatric, otherwise you will harass like any thing and not you but your son will also be victim of this thing, this could be a near possible cause, just you can do a single remained condition, and for that apply Gama benzine lotion consecutive three days all over the body and take hot water bath, apply this to your son also, see if it works or not,,, have nice day.