If you experience skin problems or complications, you should always consult your stoma care nurse straight away. However, spotting evidence of leakage early can help you catch a potential skin problem even before it develops.
Start by looking for any stoma output, either on your skin or on the back of the adhesive plate. Even if there is no direct visual sign of leakage, be aware of anything unusual, such as if the adhesive plate looks 'melted' (because the adhesive has reacted with the output).