Fibroblasts are the connective tissue cells that produce collagen and elastin.
Heating the deeper dermis to a constant 40-45°C stimulates fibroblast action and, in turn, increases the synthesis of new collagen and elastin fibres. This thermal trauma, which occurs to 5-30% of the collagen fibres, causes an immediate contraction of the fibres. This contraction results in the production of new collagen. The diameter of the collagen fibres in the treated area is increased, and the spaces between the fibres are visibly reduced under a microscope.
This tightens the skin’s appearance and stimulates the increase in blood supply.