You have given an excellent description of your young son's problem. He definitely has a condition called 'tactile defensiveness' You can read more about tactile defensiveness on Google. He should be seen by an occupational therapist.
The information provided does not constitute a diagnosis of your condition. You should consult a medical practitioner or other appropriate health care professional for a physical exmanication, diagnosis and formal
advice. Health24 and the expert accept no responsibility or liability for any damage or personal harm you may suffer resulting from making use of this content.