Cleanliness is very important. Immediately cleanse the area using a mild soap and warm water. Rinse thoroughly to ensure you've removed all traces of the slime. If the area becomes itchy, red, or irritated, apply an over-the-counter anti-rash cream. If the symptoms persist, it's best to consult with a healthcare professional. While encountering a slime monster is not common, it's always best to wash any foreign substance off your body as soon as possible for health and hygiene purposes.