With my son and his similar 3-4 SPD friends, there is no skin reaction to creams or shampoos, etc. They just don't like being touched unless you warn them or ask permission; basically being surprised is a no-no.
If the skin reacts to things, you may want to look into a skin allergy/dermatitis. There is also urticaria - reactions to touch, water, sun, etc. Do a quick search on urticaria and you'll see skin reacts like mosquito bites/welts, plus more. I hope this helps.
A 5 year old boy is always touching the girls hair in his kindergarten class,he twirls,rubs,and spells their hair even after being told it's inappropriate
2 yr old girl having bowel issues…stool gets backed Up. Been in hospital to get cleared out. On MiraLAX daily but still constipated. X-ray does not show