In most instances, herniated disc are resorbed by the body.
They do not go back into place. Often what are described as disc bulging on lumbar mri's are actually bony spurs or discosteophyte complexes. They do not resorb. Kind of counter intuitive, the larger the disc herniation the faster the disc resorbs. This is thought to be because the large disc herniation stirs up a larger immune response.