Barnacles, in general, do not hurt humans. These small, marine crustaceans are filter-feeding animals that attach themselves to various surfaces, such as rocks, shells, ships' hulls, and even marine animals like whales and turtles. While they may have a rough texture, they do not possess any venom or mechanisms to intentionally harm humans.
However, if you happen to come into contact with barnacles, you could experience some minor discomfort or potential injury. Barnacles have hard shells and sharp edges, so if you accidentally brush against them or step on them, it could lead to small cuts or abrasions. Moreover, if you swim or walk near barnacle-covered rocks or surfaces, there is a chance of getting scraped or scratched.
To avoid potential injuries, it's best to be cautious and wear appropriate footwear when walking in rocky areas with barnacles or exercise caution when swimming near barnacle-covered structures. Overall, barnacles are not dangerous creatures, but it's essential to treat them with respect and be aware of their presence to avoid any unintended injuries.