Hi, . Interesting question! Allodynia is most commonly centered around the scalp, but the American Migraine Foundation has said that it refers to the experience of pain from things that wouldn't normally cause pain, like gentle contact. Check out this link for more info:
https://americanmigrainefoundation.org/resource-library/what-to-know-about-allodynia/
Hope that helps! Thanks for reaching out. -Melissa, migraine.com team