Certain forms of cancer that cause fatigue are leukemia and lymphoma, colon or stomach cancer (causing slow internal bleeding and leading to anemia), or liver cancer.
Skin Changes

Any changes on the skin should be taken seriously.
No matter if it is moles, lumps, or skin discoloration, make sure you consult with your doctor.
Potential skin changes to keep an eye on are: moles with uneven borders, or change in color and size (probable signs of melanoma), constant sores that do not heal (may imply skin cancer), yellowing of the skin and eyes (jaundice) (related to liver or pancreatic cancer), dark spots or excessive itching (may indicate cancer of internal organs)
