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Hair follicles can also be killed by diseases. There are diseases such as cancer. Cancer results in the production of abnormal cells. These abnormal cells replace normal cells. There are cases in which cancerous cells replace and kill follicles leaving behind cells that are unable to carryout the hair production function that is typical of hair follicles. When a hair follicle carries a defect or a mutation, the body's immune cells will come and attack it killing it in the process. This means that the body itself can kill a follicle when it is protecting itself.

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