a wattle of a bird such as a turkey.
Adding to what Dominique just said, while feathers are by far the predominant outgrowths there are other bizarre protrusions, and I am not talking about the wattles or the caruncles .
the red prominence at the inner corner of the eye.
Systemic effects from eye drops can be reduced by occlusion (finger pressed on the caruncle , which is felt as a lump at the inner corner of the eye) or shutting the eyes for several minutes after putting in the drops.
an outgrowth from a seed near the micropyle, attractive to ants that aid the seed's dispersal.
The seed of this plant has a caruncle that may be involved in seed-ant interactions.