I have this bump near my nose piercing I dont know what it is ?

So I got my nose pierced a couple weeks ago maybe 3 weeks ago, everything went well they gave me my medicine to clean it and a cute little silver stud in my on nose, well I cleaned it , everything was fine and I just thought it was so special. I would say the next week, maybe eleven days after getting it pierced or more…. I was sleeping in till five pm woke up to wash my face and noticed there was no little shine or shimmer in the mirror I freaked my stud was gone! It came out while I was sleeping it must have got hooked on my blanket, I don’t know how long it was out, my sister not a pro but has many piercing helped me find it tried helping me shove it back in which irritated the skin, and hurt like hell after awhile she called a friend and her friend Mandy brought over some studs she owned to give me and I got one of hers studs back in not my original one that I was suppose to keep in during the 6 months of healing. Well ever since then I noticed a lot of crust and some puss, I cleaned it I do touch it a lot, well this morning I woke up and on the inside of my nose/nostril near the hole and back of the piercing there is a bump that looks like a white head but the head is filled with dark blood, and perfectly circled it looks like it is going to burst at the surface! So should I pop it? Leave the bump alone? Call the piercing place? or take the stud out and get it re pierced when I am older? I am 16! I don’t want to take it out! But I don’t want a infection, I have low pain tolerance, What is the bump? Do you know what the bump is and what I should do?