Can i dye my hair after having your cartilage pierced?

Well, you CAN, theoretically, but you'd have to be insanely careful. Getting bleach or chemical dye in the open, unhealed piercing would be horrible for it. I'm assuming this is a new piercing?

I have purple hair and I have to re-dye it every few weeks or so, and so far I haven't had a problem. One time I was careless and although I did not get dye on the piercing itself, I got it on the surrounding skin, which irritated my piercing like a mother! Point is, let a professional do it if you must, just be incredibly careful. Or even better, wait a few weeks until the piercing has had more time to heal. The last thing you'd want is to irritate the already tender new piercing further. If it's an old piercing then I guess never mind!