Although plasters are designed to be easily removable from the skin, sometimes a plaster might leave a sticky mess on your skin. Especially if you have been wearing it for a long while. This can be irritating and looks bad. As a first step, you can try scratching it off. Sometimes washing it with water will help. If the adhesive is stubborn try a cotton ball doused in nail polish remover on the glue. After that gently rub it off. Nail polish removers contain acetone, which can break down adhesives and glues. But after cleaning nail polish remover from your skin, apply some moisturiser to prevent dry skin.