What is the growth of the epidermal cells into the dermis forming a small tube?

The growth of epidermal cells into the dermis forming a small tube is known as a hair follicle. During development, epidermal cells invaginate into the dermal layer, creating a structure that houses the hair shaft and associated glands. This interaction between epidermal and dermal cells is crucial for hair growth and the overall health of the skin. The follicle plays a significant role in the hair growth cycle and in the regeneration of hair.