clean it twice a day at least with salt water, warm if possible. make sure the jewellery is large enough to accommodate the inevitable swelling. it doesn't sound infected, you'd know if it was. your ear would feel hot, it'd be red, it would REALLY hurt and you'd probably have a bit of pus and/or bleeding if it was really bad. lumps like that occur on cartilidge piercings, i've had them on new piercings and then again on ones i've had for over two years, it's really nothing to worry about, they come and go! once a piercing is healed i've found tea tree CREAM can reduce them, though not ideal for a piercing that hasn't healed. plus cartilidge is prone to flaring up frequently, i really wouldn't worry yourself.