If you are not on any medications like anticoagulants or blood
thinners etc., then bruising could be due to clotting disorders, low platelet count
, fragile spider veins, deep vein thrombus, deficiency of Vitamin B12, folic acid, or Vit K, a liver disease or certain cancers. It could also be due to pressure urticaria. You need to consult your doctor to rule out the causes.
If the chronic fatigue syndrome is due to an autoimmune disorder then this can cause petechiae or red dot like rash.