answer:A deficiency in certain nutrients can certainly do it. Primarily vitamin C, vitamin E, vitamin K, bioflavonoids, and zinc. Other causes can be: • long-time stress from illness, frustration or depression • smoking • frequent emotional outbursts such as anger • exposure to pollutants, allergens or heavy metals So essential an overall healthy body is more bruise resistant. Though, if what you’re doing is hard enough, no amount of vitamins, etc. will stop enough blunt force trauma.