That is your doctors decision and yours.
This is not a self treatment situation and is a serious disease.
If it is not too advanced, topical steroids can be used.
Next would be medications called vitamin D analogues.
Sometimes sunlight or light treatments are enough.
Sometimes much more powerful meds are needed.
Here is a mayo clinic write up on treatments.
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Start with a nutrient dense, anti inflammatory diet.
The diet, in order of preference in quantity, should look like thisleafy greensgreen veggiesother veggieswhole fruit, beans and peasWhole grains no yeasted breads, dry cereals or anything refinedSeeds and nuts, but cut out seeds if you have any diverticulosis.A little tofu or tempeh dailyA little high quality soy or coconut milk yogurtThe soluble fiber in this strategy will stabilized colon function in about 6 to 8 weeks, then about 2 or three helpings of animal foods a week, preferably fish, can be added back.See the book Eat to Live by Dr. Joel Fuhrman, for instructions on this type of diet.