It is not known. It may be heredity, skin cancer is from too much sun exposure, Breast cancer can be attributed to many different reasons. It is my opinion benign fatty tumors are a result of what could become cancerous because the spine is full of rich blood and cancer can flow to the back through the blood to thrive off from it. A complete body scan to locate cancerous tumors and tissue is what i would do.
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Could be a sebaceous cyst - they are very common on the head. They're not malignant; it's where the skin gets blocked and a cheesy substance called sebum collects. However, you should see a doctor to ensure it is nothing serious.
A fatty tumor on the back is called a lipoma. These fatty tumors are not life threatening. A doctor can help you understand more.