The phrase can be used with various adjectives to express different levels of fear or disgust. The eerie whispers in the old house made my skin slightly creep.
Pro Tip 2/3
Physical Reaction
It signifies a visceral, physical reaction, not just an emotional one. Think of goosebumps or shivering. As the spider crawled up her arm, it made her flesh creep.
Pro Tip 3/3
Not Literal
The phrase is figurative, meaning it describes a feeling and does not actually refer to skin movement. The haunted house story made her flesh creep, but she couldn't stop listening.