The phrase "permeate skin" implies the idea of something seeping into or spreading throughout the skin. There are several synonyms for this phrase, including infiltrate, penetrate, diffuse, imbue, and saturate. These terms describe the process by which a substance or material is absorbed by the skin to varying degrees, and may be applied in a variety of contexts. For example, a lotion might be designed to permeate skin deeply to provide long-lasting moisture, while a medication may be formulated to penetrate skin more quickly to target a specific condition or symptom. Regardless of the specific use, these synonyms all convey the notion of something entering and spreading throughout the skin.