Changing a colostomy bag is a straightforward process once you’ve done it a few times, and most people get comfortable with it within the first few weeks after surgery. The full change takes about 15 to 20 minutes. A skin barrier (the adhesive part that sticks to your body) typically lasts three to four days before it needs replacing, so you’ll go through this routine roughly twice a week.
Gather Your Supplies First
Having everything within arm’s reach before you start prevents the awkward scramble of searching for something mid-change. Here’s what you need:
- A new pouch (one-piece system, or a two-piece system with a wafer)
- Scissors for trimming the opening to fit your stoma
- A measuring card and pen to size the opening correctly
- A clean towel or paper towels
- Skin wipes designed for ostomy use
- Stoma paste or a barrier ring to fill any uneven skin around the stoma
- Stoma powder for irritated skin, if needed
- A pouch clip if your system uses one
- A disposal bag (a plastic grocery bag, zip-lock bag, or pet waste bag works well)
Many people keep a pre-packed kit in their bathroom so they never have to hunt for individual items.
One-Piece vs. Two-Piece Systems
The steps differ slightly depending on which system you use. With a one-piece system, the adhesive skin barrier and the pouch are permanently attached, so every change means removing and replacing the entire unit. With a two-piece system, you apply the skin barrier (also called a wafer) to your body separately, and the pouch snaps or clicks onto it via a flange. The advantage of a two-piece system is that you can swap the pouch more often without peeling the barrier off your skin each time. The barrier still needs replacing every three to four days, but you get more flexibility in between.
Removing the Old Pouch
Start by emptying any contents from the pouch into the toilet. If you’re worried about splashing, try sitting backward on the toilet seat and placing some toilet paper in the bowl first to break the surface tension.
Once the pouch is empty, gently peel the skin barrier away from your body. Work from top to bottom, pressing one hand flat against your skin while the other hand lifts the adhesive. This keeps the skin taut and reduces pulling. If the adhesive is stubborn, special adhesive remover pads or sprays can help dissolve it. One important note: if you use an oil-based adhesive remover, you need to wash that residue off thoroughly with a non-oily soap and water before applying a new barrier. Any oily film left behind will prevent the new adhesive from sticking.
Cleaning the Skin Around Your Stoma
This step is simpler than most people expect. Clean the skin around your stoma with warm water and a soft washcloth or paper towel. That’s it. You don’t need special cleansers for routine changes.
What you should avoid matters more than what you use. Soaps with oils or moisturizers leave a residue that weakens adhesive grip. Alcohol and harsh chemicals can make the skin raw and sore. Baby wipes are a common mistake: they contain ingredients that either irritate the skin or interfere with the seal. If you want to use a wipe, only use products specifically designed for peristomal (around-the-stoma) skin care.
After cleaning, pat the skin completely dry. Moisture trapped under the barrier is one of the most common reasons for early leaks.
Measuring and Cutting the New Barrier
Your stoma can change size in the months after surgery, so measuring before each change is a good habit, especially in the first eight weeks. Hold the measuring card up to your stoma and find the closest matching circle. Trace that size onto the back of your new skin barrier, then cut along the line with scissors.
The opening should fit snugly around the stoma with very little exposed skin between the stoma’s edge and the barrier. A gap that’s too large leaves skin unprotected and vulnerable to irritation from output. A gap that’s too small can press against the stoma and cause swelling.
Applying the New Pouch
If your skin has any uneven areas, creases, or folds near the stoma, use a barrier ring or a thin line of stoma paste to fill them in and create a flatter surface. Barrier rings are generally easier to work with. A common mistake is applying too much paste, which can actually prevent a good seal rather than improve one. Less is more here.
If your skin is irritated or slightly broken down, lightly dust stoma powder over the affected area, then brush off the excess before applying the barrier.
For a one-piece system, peel off the adhesive backing and center the opening over your stoma. Press the barrier firmly against your skin, starting at the stoma and working outward. Hold gentle pressure with your hand for about 30 seconds. Body heat helps activate the adhesive, so some people press a warm hand or a warm cloth over the barrier for a minute to improve the seal.
For a two-piece system, apply the wafer the same way, then snap or press the pouch onto the flange until you hear or feel it click into place. Give the connection a gentle tug to confirm it’s secure.
Preventing Leaks
Leaks are the most common frustration, and they almost always have a fixable cause. The first thing to check is whether the barrier opening matches your current stoma size. A stoma that has changed shape since your last measurement will leave gaps in the seal.
Skin folds and creases around the stoma create channels where output can travel underneath the barrier. A barrier ring pressed into the fold can fill that gap. If your stoma sits level with or below the skin surface rather than protruding slightly, a convex skin barrier may help. Convex barriers have a curved shape that applies gentle downward pressure on the skin surrounding the stoma, encouraging it to protrude more so output flows into the pouch instead of under the seal. When using a convex barrier, try it first without a barrier ring. The closer the convexity sits to the base of the stoma, the better the seal. Add a barrier ring only if the seal still isn’t holding.
Changing your barrier on a predictable schedule, before you notice any looseness, also prevents most leaks. If you consistently get less than three days of wear time, something about the fit or application likely needs adjusting.
Disposing of the Used Pouch
Place the used pouch into a disposal bag and knot it shut before putting it in the trash. Dog waste bags, sandwich bags, and zip-lock bags all work. Some people use odor-sealing disposal bags designed for diapers or ostomy products, which contain the smell more effectively. The key is sealing the bag before it goes into a wastebasket. If you’re in a public restroom and don’t have a disposal bag, wrapping the used pouch in several layers of toilet paper before placing it in the bin is a reasonable backup.
To manage odor during the change and throughout wear time, liquid deodorizing drops can be placed inside the bottom of a new pouch before you apply it. Air freshener sprays designed for ostomy use are another option for the bathroom itself.
What to Watch for on Your Stoma
Each time you change your pouch, take a moment to look at your stoma. Healthy stoma tissue is moist and pink or red, similar to the inside of your cheek. Minor bleeding when you clean around it is normal and not a cause for concern.
A stoma that looks noticeably paler than usual could indicate a problem with blood supply and warrants a call to your care team. The same goes for a stoma that appears dark purple, blue-black, or significantly swollen compared to its usual size. Severe abdominal pain combined with vomiting, or a stoma that has pushed outward much further than normal (prolapse), are situations that need prompt medical attention because they can signal a blockage or compromised blood flow to the bowel.