Which process involves the application of heat to facilitate product penetration in skincare?

The process that involves the application of heat to facilitate product penetration in skincare is steaming. Steaming opens up the pores, softens the skin, and increases blood circulation, which enhances the skin's ability to absorb products applied afterward, such as serums and moisturizers. This treatment is commonly used in facial routines to prepare the skin, allowing active ingredients in skincare products to penetrate more deeply and effectively.

Washing is primarily about cleansing the skin to remove dirt and impurities, and while it prepares the skin for further treatments, it does not inherently involve heat or enhance penetration through heat application. Moisturizing involves applying products to hydrate the skin but does not utilize heat as a means of facilitating absorption. Exfoliating helps to remove dead skin cells but again does not include the application of heat to assist in product penetration specifically. Thus, steaming stands out as the correct choice due to its heat application resulting in enhanced absorption of skincare products.