excrescence

noun3

1. •
   Something, usually abnormal, which grows out of something else.

   • The squirrels were in hiding. One only he saw,—a sleek gray fellow, flattened against a gray dead limb so that he seemed a part of it, a woody excrescence upon the wood itself. — 1903
2. •
   A disfiguring or unwanted mark or adjunct.

   • Being bussum buddies, the two friends often communicated with mere exchange of psychic forces, verbal communication having been rendered unnecessary excrescence. — 1982
3. •
   The epenthesis of a consonant, e.g., warmth as [ˈwɔrmpθ] (adding a [p] between [m] and [θ]), or -t (Etymology 2).