In medicine, a<unk> refers to a small aggregation of cells.<unk>  may form on tendons and muscles in response to injury. The vocal cords may also develop<unk> .<unk>  are normally benign and often painless, although they can affect the functioning of the organ.
Nodule 
Tissue 
Buccal mucosa
Skin appendage
Tooth enamel
Clavicle
Atom
Gumma 