Final answer:
Check the area for increased redness, swelling, and pain when a hot or cold application is in place to prevent skin and tissue damage.
Step-by-step explanation:
When a hot or cold application is in place, such as using a cold hot pack for medication or therapy, one should always check the application area frequently for any signs of damage. It's important to observe the skin for any increased redness, swelling, and pain because these symptoms may indicate tissue damage or an adverse reaction to the temperature change, such as a burn from heat or frostbite from cold. Additionally, care must be taken to ensure the hot or cold application is not too extreme, as it can cause skin and tissue damage.