The hemipenes of the male lizard will be swollen everted, that is, on the outside of the lizards body. There is no definite cause of penis prolapse.
The veterinarian will apply an ointment to the hemipenes, and slowly massage it back into the vent. This is the only real treatment for penis prolapse. If the ointment and massaging do not work, the hemipenes may need to be amputated.