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A doctor will ask about your symptoms and ask for your familys medical history

Mutat Res 113:173215 Ames BN, Lee FD, Durston WE (1973) An improved bacterial test system for the detection and classification of mutagens and carcinogens

Increased proinflammatory cytokines direct tryptophan metabolism towards the production of kynurenine, decreasing serotonin availability and generating neurotoxic metabolites (quinolinic acid)

Some of these factors include your skin type, tone, layering of the tattoo, location, pigmentation, the amount of ink applied to your tattoo, the kind of pigment used, whether homemade pigment or professional ink was used, and any pre-existing scars from the tattoo