Unwanted tattoos can be removed partially or fully.
Depending upon the size and site of the tattoo, it can be removed by laser treatment or surgically. An experienced Plastic and Cosmetic Surgeon decides on the procedure after examining the patient.

Tattoos that are removed by laser treatment, require many sessions to remove them completely.
Tattoos can also be removed surgically under local anesthesia Skin that contains tattoos is excised and is later stitched. This technique is mainly for small tattoos. Larger areas require general anesthesia. It takes time for the skin to heal after the removal.
People believe there is no scarring from the process but it does happen. Dark skin tones can have scarring due to loss of pigmentation after laser treatment. Also, not all tattoos can be removed by surgery. Therefore, it is advisable to consult a Plastic Surgeon to understand the pros and cons of the surgery.