One positive of a tattoo is that is a permanent way to remember a person, thing or idea that is meaningful in an individual's life, while a negative of a tattoo is that it is permanent and may only be removed with costly laser treatments. Tattoos are safe when performed by a reputable business, but they can transmit blood-borne diseases if the equipment is not properly sterilized.
A disadvantage of tattoos is that even properly performed tattoos can cause an allergic reaction to the dye. Infections are possible as the tattoo heals. An advantage of tattoos is that they allow individuals to adorn their body with designs that they love. Some workplaces do not employ individuals with visible tattoos, but getting a tattoo in an easily-covered location makes this a moot point.