today there are amazing cover up applications that models can wear that blends with skin and makes it look like their ink is gone. Also, many mags photoshop ink out. Then you will see some stuff from the same period where a person has ink and in other photos they don't

Some mainstream models go through this as well. Candid pics will show their ink, while pro shots will not.

You also see this sometimes on the homepage of sports teams. they will shop out ink on players in team photos to make them look less "gangsta"