Can Speech Therapy Help Rhotacism Has Anyone Out There Had Success With Speech Therapy For A Vocal Cord Cyst?

Has anyone out there had success with speech therapy for a vocal cord cyst? - can speech therapy help rhotacism

My 16-year-old son has a cyst on the vocal cords. Her voice is a very hard time and she is tired. Has anyone out there has an improvement in the voice processing speech quality alone? I have problems in obtaining guarantees of speech, if they can help or not.