M 8 yo, hes been tired more lately, some bruising on legs and other day had a mild temp of 100.6 but not sick. is it cancer or leukemia? im scared. he is a very typical active boy, plays sports etc. what on blood test would show this, high wbc?

You should go to see your doctor or clinic and allow the boy to be examined and diagnosis properly. It is senseless to try and get these type of results online. The 100.6 F temperature is not normal. Please go to your family doctor or nearby clinic as soon as possible and get appropriate care.

A CBC & differential white cell count including a platelet count is a starter&would point toward leukemia(high wbc) most likely if present. However, there are other blood conditions that cause fatigue& easy bruising. It's always best to begin a medical workup with an examination by a physician who will then order specific testing based on the history,system review&complete physical exam findings.