I know people use KY Jelly or honey on prolapses, so that might be worth trying if there is no bleeding or not a lot of swelling.
from tf
Once this happens, the turtle must be removed from the habitat, as other turtles (as well as the prolapsed turtle itself) my see this as a food item and bite it, causing serious injury and often times, death. Recommended home treatment is to place the animal in a clean, smooth container (I use the bathtub) and coat the prolapse with either granulated sugar (dry sugar, not a water:sugar solution) or honey. This will assist in reducing any swelling and hopefully allow the prolapsed item to be drawn back into the body. It is best to immobilize the turtle to prevent the animal from stepping on it, dragging it, cutting it, or even severing it while it walks and/or struggles. If it goes back in on it's own, that's great. If not, once the swelling has gone down, you can GENTLY try to assist it back into the vent. If you do not feel comfortable with this, it's not working out or you think there is possibly damage to the prolapsed material, then get the turtle to a qualified vet. The vet will assist the animal, sometimes surgically, in returning the intestines to their proper place. At times, removal of a section of the intestinal tract is required, especially if the exposed tract becomes injured. The vet will also suture a purse string to help prevent this from happening again.
Penile Prolapse
This is sometimes secondary to an existing condition, but sometimes it is just one of those things that ‘just happens’. When this occurs, the turtle should be removed immediately if housed with other turtles. I have personally witnessed one being bitten (yes, ouch) by another turtle, even though it was not in a prolapse situation. It is not uncommon for turtles to ‘display’ themselves for short periods of time or times of stressed, so do not be alarmed. At times, when retracting their organs, they may appear to swat or kick at it while it withdrawls. This does not mean they are experiencing a prolapse. If it goes back in, all is good.
With clean hands (preferably With clean hands (preferably sterile gloves, but not everyone has these at their home), lubricate the organ with KY Jelly, and gently attempt to assist the organ back into the turtle. If this fails, as above with the intestinal prolapse, coat the penis with dry, granulated sugar or honey to assist in reducing the swelling. If the penis does not go back in on it's own, you can GENTLY try to assist it back into the vent. If you do not feel comfortable with this, it's not working out or you think there is possibly damage to the prolapsed material, then get the turtle to a qualified vet. Some conditions need some topical medication to assist in returning the prolapse, followed by a suturing which will be removed a few days later. Waiting too long or drastically traumatized organs may require amputation, but this is a very rare case.