For episiotomy tears (or if you have hemorrhoids), try soaking in sitz baths - a bath in which only your hips and buttocks are in the water - with added Epsom salts. This allows more blood to get to the infected area, which should improve healing. You will be given a squirt bottle to rinse the area after going to the bathroom; you can also use ice packs or witch-hazel pads to soothe the affected tissues. I recommend taking stool softeners to make sure there's little stretching of the area when you're trying to go to the bathroom (pressing a towel on the tear during a bowel movement can help relieve some pain by providing counter pressure).
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