All vertebrates have general sensors in their skin for touch, pressure, and pain. These are called
The part of the hair below the skin's surface is called the follicle. The hair follicle is essentially the root of the hair where it begins to grow just beneath the surface of the skin.
Oils on skin surface
Dry skin can crack, allowing the bacteria to get below the surface of the skin.
Pain receptors (nociceptors) are the sensors in the skin that are closest to the surface and detect potential harm or damage to the body. They play a crucial role in alerting the brain to potential injuries or threats.
Fascia/connective soft tissue.
Various microorganisms can live below the skin surface, including bacteria such as Staphylococcus epidermidis and Propionibacterium acnes. These organisms are part of the normal skin flora and play a role in maintaining skin health. However, disruptions in the skin microbiome can lead to skin conditions such as acne or infections.
They are called impressed prints. You can read more about them at the below link:
superficial
When you touch a cold metal surface, moisture in the air can condense on the surface, creating a thin layer of water. This water can make the metal feel sticky when you touch it because your skin can't easily glide over the wet surface. The sensation of stickiness is due to the interaction between your skin, the water, and the metal surface.
The hair shaft, which is above the skin's surface, is considered dead tissue. The living portion of the hair is the hair follicle, located below the skin's surface.
Nervous system, because it receives signals for detectors on the surface of the skin. It's how you touch, feel temperature, etc.