If you are/have any of the following then cosmetic tattooing cannot be performed.
Pregnant of breastfeeding
Suffer from Keloid Scarring
Pink eye/psoriasis/active herpes simplex. Wait until condition clears.
Type 2 Diabetes. A doctors consent is needed.
Allergy to Nickel
Sickle cell anemia, hemophilia, any patients on anti-coagulant medication.