What's sebaceous gland?​

The sebaceous glands are holocrine glands that produce sebum, a semiliquid mixture of glandular cell debris containing glycerides, free fatty acids, wax esters, squalene, cholesterol, and cholesterol esters. The largest and most numerous sebaceous glands are found on the face, scalp, chest, and back.

In my own words it wilts due to the heat and lack of moisture after a certain time of being unwater the wilting state begins

soon enough if not given water it will die from dehydration