What happens to the skin when a thermal mask cools?

When a thermal mask cools, it has a tightening and toning effect on the skin. This phenomenon occurs because the cooling process helps to contract the skin, which can enhance its firmness and reduce the appearance of pores. Additionally, the cooling sensation can stimulate blood circulation, potentially leading to a more revitalized and toned appearance. This outcome is particularly beneficial in skincare routines aimed at improving the texture and elasticity of the skin, making option B the correct choice.

Although other effects may be noted with different types of treatments or conditions, in the context of a cooling thermal mask, the primary and key response is the tightening and toning of the skin.