Goosebumps, also known as goosebumps or goosebumps, are a natural reflex of the body. This phenomenon often occurs when you are cold or experience strong emotions such as fear, surprise, anger, excitement... At that time, the skin will form small round, swollen bumps on the skin due to self-spasm of the hair follicles. These spots come from muscle contractions attached to each hair. Hair is embedded deep into the skin and the hair root is located in a capsule (follicle). Each follicle is exposed to a muscle that will cause the follicle to swell and cover the skin, forming beads on the surface of the skin. That's "goosebumps". When the follicle swells, the hair inside will stand up.