I was just wandering what this whiteish bulge stiking out of my leopard geckos butt is,and if it is a big problem.
That could be a sperm plug (or seminal exudate). It is normal in Male geckos. Typically, they pop out on their own but sometimes can be retained. Try soaking him in a warm bath for about 20 minutes. Afterwards, gently rock it back and forth to remove it. Don't force or pull it. A more serious issue may be a prolapsed hemipene which should be considered a veterinary emergency. In this case, have him examined by your veterinarian or a vet experienced in treating reptiles as soon as possible for diagnosis and treatment.
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