My blood count was completed few weeks ago. everything in normal range. but now i am getting bruises all over thighs - arms - legs and back. why?

Not to worry: If blood counts are normal, we know that your red cells and platelet numbers are good. They can still cause bruising if your blood is a bit thinner than usual. This is common with Aspirin, anti-inflammatories like advil, (ibuprofen) and supplements like fish oil. If you are taking these, you can stop or talk to your doctor. If not, you may need a further workup.