Saturate a clean cotton diaper or an old, but well-washed, cotton terry dish towel with the liquid of your choice: 
Castor oil, comfrey leaf/root infusion or oil, plantain leaf oil, calendula oil, witch hazel lotion/infusion, or any other healing herbal oil or infusion you wish to use.

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For a cold compress: Apply to body as is.

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For a hot compress: Fold the saturated towel into quarters, wrap in foil, bake for 15–20 minutes until very warm but not too hot to handle.

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Unwrap and apply the compress.

To keep the heat in, cover with a heavy towel and/or a hot water bottle or heating pad. 
Remove when cool or after fifteen minutes.

For repeat oil compresses, add more oil to the same towel. 
An oil compress may be used over and over again.

When using infusion or witch hazel, refrigerate towel after use and wash every third day. Infusion compresses can rot and smell bad.

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Hot compresses are used to relieve pain, counter stagnation, dissolve growths (fibroids, cysts, polyps), and warm and strengthen the organs of the pelvis. They are not used when there is infection or fever.

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excerpt from Down There: Sexual and Reproductive Health the Wise Woman Way.