Something is going on with my tortoise tail, it has a big bump and blood is coming out from it. Here you may see some pictures. Could you please help me figuring out what kind of disease this is, why did it happen and how may I cure it?
Looks like a prolapse. Keep it moist, even if you have to keep it in a small container of water and get it to a vet ASAP. They'll either push it back in and sew it up or it may need to be amputated. Keeping it moist is key.
Then you need to figure out why it prolapsed in the first place an fix the cause or it will just happen again.
That is what a tortoise penis looks like. Some tortoises will put out the penis when they first come of age. They might play with it on and off for a few days but then lose interest. If the penis doesn't go back inside on its own, you will have to take him to a vet.