i had a friend growing up who was bruised ALL the time. she was like a banana. i HAVE anaemia and i dont bruise.
Bruises Overview
A bruise is a common skin injury that results in a discoloration of the skin. Blood from damaged blood vessels deep beneath the skin collects near the surface of the skin resulting in what we think of as a black and blue mark.
Bruises can occur in some people who exercise rigorously, such as athletes and weight lifters. These bruises result from microscopic tears in blood vessels under the skin.
Unexplained bruises that occur easily or for no apparent reason may indicate a bleeding disorder, especially if the bruising is accompanied by frequent nosebleeds or bleeding gums.
http://www.emedicinehealth.com/bruises/page2_em.htm
Bruising is the body’s normal response to local trauma or damage. Local bruising needs investigation to diagnose and treat the underlying cause of the bruising. Certain medical conditions such as bleeding disorders can also lead to more generalized or excessive bruising. People with these conditions bruise easily and more than normal. Some possibilities include hemophilia (genetic disease) and the lesser known and often undiagnosed Von Willebrand’s disease. ANY UNEXPLAINED BRUISING NEEDS MEDICAL INVESTIGATION.
http://wrongdiagnosis.com/sym/bruising.htm