My body breaks out in hives after a shower everytime. none of my family members have this happen. i have changed all shower products also.

Urticaria: A rise in core body temperature resulting in sweating causes the rash in cholinergic urticaria. Common triggers include: Exercise Hot baths/showers Fever Occlusive dressings Eating spicy foods Emotional stress http://www.dermnetnz.org/topics/cholinergic-urticaria/

Urticaria: could be cholinergic urticaria, a type of physical urticaria that is triggered by exposure to warm environment, also much less common is aquagenic urticaria, triggered by water exposure, not your case. You can try a 2nd generation antihistamine as cetirizine or loratadine to control it, but read the labels carefully, if that doesn't work, see a dermatologist or an allergist, best wishes

Could be heat: Some people get hives when they get hot. Try cooler showers and see if that helps. It is good that you changed your shower products but you should try using only hypoallergenic products and see if that helps. If you can't get this to resolve see a doctor or allergist.