Tattoo is not visible on autopsy. But the presence of tattoo was informed by relative. What is the next site to check?

* The regional lymph nodes near a tatoo mark show a deposit of a pigment.* A faded tattoo mark becomes visible by the use of ultraviolet lamp or rubbing the part and examining with magnifying lens.* Infrared photography makes old tattoos readily visible.* The marks are recognised even in decomposed bodies when the epidermis is removed by wiping the area with a moist paper towel or a piece of cloth.