system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: why don't we get goosebumps on our face?
gpt
Goosebumps appear when the Erector Pilli muscle (very close to the hair follicles) contracts. These muscles are slightly larger in Vellus hair (the fine hair that covers our bodies save for palms and soles) follicles than facial hair follicles.