Can people with AIDS get tattoos?
Posted due to certain inaccuracies in comments and answers provided to this question regarding the Human Immunodeficiency Virus.

It should be noted that while it may not affect the ability for macrophages in the dermis to phagocytose the heavy metals found in the inks used in tattooing, and thus not interfere with the fixing of a tattoo in an HIV+ person, the Human Immunodeficiency Virus, the virus responsible for Acquired Immune Deficiency Syndrome (AIDS) does in fact have the ability to infect any cell type that expresses the cell surface glycoproteins CD4 and CCR5.

Cells that express CD4 and CCR5, barring mutations seen in the bone marrow received by the Berlin Patient (Timothy Ray Brown), among them CD4 "Helper" T-Cells, Macrophages, and certain Dendritic Cells, are all capable of being infected by the HIV virus.

Glycoprotein 120, found on the surface of the HIV envelop, binds with high affinity to CD4. The coreceptor CCR5 then binds to the gp120 CD4 complex and allows the HIV envelop to fuse with the plasma membrane of the host cell. The fusion then delivers the viral nucleocapsid and associated proteins into the cytoplasm of the cell and the infection takes place.

If I had to venture guess, I would say that as Macrophages tend to be present within the dermis of the person for extend periods of time, there is likely enough of a population present in the skin to have the macrophages necessary to fix the inks used in tattooing.