The difference between keloid-prone skin, hypertrophic scars, and keloids:

1. Keloid-prone skin: Refers to the tendency of some individuals to develop keloids in response to skin injuries or inflammation. Keloids are thick, raised, and often itchy scars that extend beyond the boundaries of the original wound.
2. Hypertrophic scars: Also known as raised scars, are similar in appearance to keloids but do not extend beyond the boundaries of the original wound.
3. Keloids: Are scars that grow beyond the boundaries of the original wound and can continue to grow over time, causing discomfort, itching, and pain. They are often thick, raised, and have a rubbery texture.

In summary, keloid-prone skin is the predisposition to develop keloids, hypertrophic scars are raised scars that do not extend beyond the boundaries of the original wound, and keloids are thick, raised scars that extend beyond the boundaries of the original wound.