Caruncle: a soft, naked, fleshy excrescence or protuberance.
"Explanation of Terms Used in Entomology" by John. B. Smith
The face is covered with corrugations or caruncles and should be red in color.
"Ducks and Geese" by Harry M. Lamon
The throat, also, is sometimes ornamented with a beard, or with wattles or caruncles.
"The Descent of Man and Selection in Relation to Sex" by Charles Darwin
The role of the caruncle in opening the shell seems to vary among different species of turtles.
"Natural History of the Ornate Box Turtle, Terrapene ornata ornata Agassiz" by John M. Legler