If your gums are turning black and have a cold sensation, I would suspect gingivitis or some other form of periodontal disease; in any event, this certainly should be examined by a dentist!
You feel a cool sensation because the refrigerator is full of cold air.
A cold sensation it shockes your body and that is its reaction
The sensation of cold air on your skin can feel sharp, brisk, and invigorating. It may cause your skin to tingle or feel tight, and can create a refreshing contrast to warmer temperatures.
The cold floor can make you feel uncomfortable because it causes your body to lose heat, which can lead to a drop in your core body temperature. This can trigger a physiological response that makes you feel cold and uncomfortable. Additionally, the sensation of cold on your feet can also affect your overall comfort and well-being.
An endothermic reaction feels cold because it absorbs heat from its surroundings. This can sometimes give the sensation of cooling or a decrease in temperature.
A black widow spider bite can lead to intense pain and sometimes a sensation of coldness in the affected area due to the venom spreading through the bloodstream. Seek medical attention immediately if you suspect you have been bitten by a black widow spider.
Drinking cold water feels good because it can help lower your body temperature and provide a refreshing sensation, especially when you are hot or thirsty.
THAT IS CUZ ITS NOT A MOLE. U'D BETTER HAVE IT CHECKED WITH A GP
Most minerals feel cold to the touch because they conduct heat away from the skin. However, minerals like azurite or malachite can feel cold due to their high thermal conductivity. These minerals quickly draw heat away from the skin, giving the sensation of coldness.
When you come inside from the snow, your body tries to maintain a stable core temperature by constricting blood vessels near the skin's surface to conserve heat. This can lead to a sensation of feeling cold as the blood vessels restrict and limit blood flow, making you feel chilled until your body adjusts to the new environment.
After a hot bath, your body temperature rises due to the warm water. When you step out of the bath into cooler air, your body may perceive this change in temperature as a drop, leading you to feel cold. This sensation is called thermal shock and can make you feel colder than you actually are.
Ethanol feels cold when applied to the skin because it evaporates quickly, absorbing heat from the skin in the process. This rapid evaporation leads to a cooling sensation on the skin, similar to how rubbing alcohol or hand sanitizer may feel cold upon application.