A stoma is usually moist and pinkish-red because it is a mucous membrane, just like the mucous membrane inside your mouth. After surgery, your stoma may be dark red and quite swollen to begin with but will reduce in size over time – usually after six to eight weeks.
The stoma usually sits on the left side of your abdomen, below your waist. However, it will depend on the section of your colon that's been removed. Prior to your surgery, you will have a consultation with a stoma nurse or your surgeon during which you can discuss the placement of your stoma.
There is no sensation in the stoma so it is not painful to touch. The stoma can bleed a little when you clean it, especially in the beginning, but this is quite normal, and should stop shortly afterwards.