As an oncologist I don’t have anything to get alarmed. As general advise I can say first consider repeating your blood peripheral smear - if this persist - considering most common cause iron deficiency your Iron profile should be checked with associated work up for essential vitamins . However, anisocytosis can also occur in the absence of anemia, seen in some medical conditions such as liver disease, hypothyroidism, and some autoimmune disorders. So consult a general physician or a haematologist for further advice .