Infection and hot and cold sensation on the skin and other factors can cause facial vascular and motor nerve disorders, telangiectasia, excess oil secretion resulting clogged pores, and closed acne. In addition, bacterial infection leads to vasodilation, swelling and improper treatment. Thus rosacea begins. OVZ removes rosacea through three steps: improve oil and water balance and clear pores; reduce bacteria and remove red light marks; shrink pores and repair barriers, thus removing the root of rosacea.