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There are normal ridges in the rectal tissue but it should be mostly smooth. If there are bumps, this is most likely a hemorrhoid you are feeling. You wil have to see your doctor for an exam to confirm. Hope this helps.
For internal hemorrhoids, you need to make sure that you have normal bowel movements. Constipation is the most common cause of internal hemorrhoids. You need to be on a bowel regimen to keep your stool soft. Besides that, using Preparation H is the only thing you can do on your own. They do not go away, and you may need a simple surgical procedure by general surgeon to get rid of them.