References for “Tattoos: Leaving their mark”
Armstrong ML. "Tattooing, body piercing, and permanent cosmetics: a historical and current view of state regulations, with continuing concerns," Journal of Environmental Health (April 2005), Vol. 67, No. 8, pp. 38-42.
Cui W, et al. "Pseudoepitheliomatous hyperplasia — an unusual reaction following tattoo: report of a case and review of the literature," International Journal of Dermatology (2007), Vol. 46, pp. 743-745.