All surgery carries risks. The main risks are:
Bleeding and haematoma
Wounds can bleed after surgery. A build-up of blood under the skin is called a haematoma. A haematoma may require more surgery to remove it. A haematoma may affect the appearance of the end result.
Infection
A surgical wound can become infected. With surgery on uninfected clean skin this unlikely with less than 1 out of every 25 wounds becoming infected. Infections will usually settle with antibiotics but it is possible for the infection to form an abscess and then discharge through the wound or require surgery to drain it. Infection progressing to sepsis which is potentially life threatening is very rare in healthy people having skin surgery.
Wound breakdown and delayed healing
Wounds can open up or breakdown. This is most likely to happen if the wound is stressed in the early stages of healing or if it becomes infected. The wound will then usually heal ‘from the bottom up’ and this may take several weeks. The result is usually a wide scar that may be depressed. With a flesh tunnel repair it is possible for the repair to come apart. It would be necessary to let it heal but this would usually result in a large split in the earlobe. A re-repair will usually be possible but this would have to wait until the wound was fully healed and the scar matured, typically several months.
Poor scarring
Most people find the scar from surgery acceptable and worth the benefits of the surgery. The appearance of scar varies a lot from one person to another. Some people may very good nearly invisible scars when others with a similar wound may make an unsightly poor scar. Poorly planned surgery and complications like infection may well lead to poor scars. For other people a genetic tendency to make hypertrophic or keloid scars may result in a poor appearance of a scar. The section on the website about scarring has more details on poor scars.
Deformity of the earlobe
When a large flesh tunnel or complex splits are repaired it may affect the contour of the earlobe. Usually, surgery results in an improvement but complex scars can result in irregularities and even deformities. This is most likely if the wound becomes infected or breaks down during healing.