We will never repeat it too many times :
Using a gun on cartilages is BAD.
(other parts of the body, same thing ! BAD BAD BAD !)
Not only because it is unsterile, not only because it make a hole with the jewel itself and break the skin, not only because people who do it don’t have any formations for how to pierce, but because the jewel is NOT adapted to the cartilage !
Lenght is not good. Material is not good (gold, or surgical steel, i’ve never seen titanium!), the ending is not good and compress everything. When the cartilage swell, the jewel is too short.
That’s why body piercers make the hole with a sterilized needle, put a titanium jewel in (labret or barbell with minimum 8mm longer) and preconize proper aftercares. It is NORMAL to have a swelling, that can least some weeks, the jewel has to be long for that !
Do NOT change the jewel after only 3 weeks
Do NOT turn it with unwashed hands ! (mostly of the infections come because you put your fingers on it, or for the girls, with long hair : when you replace your hair behind your ear, be careful, you contaminate your piercing with your fingers !)
Put good material when changing it, cartilage can take more than 6 months to heal properly. Sometimes rings (BCR, segment ring, spirales, horse ring) can make keloids, so put back a straight barbell with long lenght if necessary !
Keloids can be really hard to go away, be patient.
And never pierce your cartilages, including tragus, with gun piercing. NEVER !
Even if it’s cheaper…