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Vocal fold polyps (VFPs) are generally unilateral and have a broad spectrum of appearances, from hemorrhagic to edematous, pedunculated to sessile, and gelatinous to hyalinized. Vocal fold polyps (VFPs) are believed to result from phonotrauma; however, they are also recognized to potentially arise from a single episode of hemorrhage.
Phonotrauma: What You Need to Know. 1  Vocal nodules (callouses) are superficial lesions on the lining of the vocal cords and usually occur in the middle of both vocal folds.  A vocal cord polyp (blister), usually on one vocal cord, can be soft or firm and can be clear or red from hemorrhage.