A touch-up is suggested, but not required. The treated area will last longer following a touch-up 8-12 later and/or can be done 3-6 months.
Coverup/corrections in most cases a 2nd session is recommended to make changes or corrections, the old implanted ink plays a role in the healing process, your skin has received trauma from your first tattoo and might have done some tissue damage, this is why a 2nd appointment is required to ensure your artist can observe how well your skin is retaining the new pigment