If you are anemic or possibly suffer from a defficiency this can cause you to bruise easily. If your light skinned that can cause bruises to seem darker.
Diseases such as hemophelia and other more common diseases such as diabetes can cause a person to bruise easily. Other than that, aging skin can cause bruising to occur easily.
Many things can cause you to bruise easily. Different blood thinners are well known to do it. Extensive brusing may be something as serious as leukemia.
If you bruise easily, you may be anemic. However, if you have bruises that just appear, you need to see a doctor immediately as this may be a sign of cancer.
Bruising easily can happen for different reasons. Sometimes easy bruising runs in families. Females tend to bruise more easily than men. Older people may bruise easily because their skin is fragile and they have less fat deposits under the skin. Medications like coumadin and aspirin can cause bruising.