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It is common for fingernails to have purple creases during any type of chemotherapy, not only with Taxol. However, the entire toe, with the skin and all, turning purple may not be entirely explained by Taxol neuropathy. Neuropathy can affect the blood vessels in these areas that can give rise to that purple color. However, if you have other vascular problems or predisposing conditions such as high blood pressure, high cholesterol, or diabetes, then the blood flow to that area should be properly assessed. I suggest you discuss this options with your doctor, and ask him regarding tests for vascular patency (like doppler studies if applicable). Other predisposing factors to vascular problems should also be addressed (cholesterol, diabetes, etc.).
Regards and God bless.