Thanks for posting your query.
Bruises over leg can be due to blood disorders,infection,coagulopathy
, vassculitis or autoimmune disease
. As you have history of anemia and DVT, then Disseminated Intravascular Coagulation
should also be ruled out.
You should visit your doctor and get tests like CBC,ESR,PT,APTT,D-dimer,serum fibronigen, C-reactive protein
. Then it will be easier to reach a proper diagnosis.
Hope it helps.