Using expired makeup on a wound is not advisable for several reasons.

Firstly, makeup, whether expired or not, is not formulated to be used on broken skin or wounds. It's designed for healthy, intact skin and may contain ingredients that could potentially irritate or infect a wound.

Secondly, expired makeup can harbor harmful bacteria and fungi. Over time, the preservatives in makeup that are designed to prevent the growth of these microorganisms can break down and become less effective. This is particularly true if the makeup has been stored in a warm or humid environment, or if it has been contaminated with fingers or applicators that were not clean. Applying such products to a wound could introduce these bacteria or fungi into the wound, leading to infection.

Thirdly, the chemical structure of some ingredients in makeup can change over time, especially after the product has expired. This can lead to the formation of substances that could potentially be harmful or irritating to the skin. Applying such products to a wound could cause irritation, inflammation, or even a chemical burn.

In conclusion, if you have a wound, it's best to clean it with warm water and a gentle soap, apply an antiseptic if you have one, and cover it with a clean bandage. If the wound is deep, large, or doesn't stop bleeding, seek medical attention immediately.