Your stoma can change in size, so it is advisable to measure regularly if the opening in your baseplate is the right size.

Solution
If you are having trouble getting the fit perfect, supporting products like the Brava Mouldable ring can help you create a seal around your ostomy. You can also talk to your ostomy care nurse about using a convex solution, which will help push the area around the ostomy down.

The skin around the stoma is often uneven due to dips, creases or folds. The number and depth of these vary from person to person. Uneven skin can compromise the fit of your appliance, which can cause leakage, and then subsequently, skin irritation. Even small creases in the skin can enable output to leak in under the adhesive and come in contact with the skin surface.
That is why you should check the adhesive for signs of output leakage and check the condition of the skin around your stoma every time you remove a baseplate.

Perhaps you were squatting, bending, or twisting your torso. This should of course not cause leakage, but if it did, it is a sign that your pouch is having trouble following your body movement.

Solution
Consider using an elastic tape like the Brava® Elastic tape to secure the edges of the adhesive baseplate a little more. You can also talk to your Stomal Therapy Nurse about using a convex solution, which will help your pouch follow your body movement.

Depending on fit and body shape, some movements might simply be a little too vigorous for the pouch to withstand.

Solution
Elastic tape could help, but for more strenuous movement, an ostomy belt may be the more secure solution if that is an option for your system.

This could be a sign of maceration, a skin condition caused by excessive moisture, similar to the pruning that happens to your fingertips after a long bath. If this is the case, the leakage might have happened because the moist skin surface makes it harder for the adhesive to stick.

Solution
Make sure the skin is completely dry before applying a new pouch. You may also consider changing the type of adhesive you use to one with a longer wear time.