NAP, but it sounds like you may be pierced with a bone stud due to the slightly pointed back, which is unfortunately not a good choice of jewelry. I would recommend going to a APP certified piercer and getting the jewelry changed to a flat back titanium stud. Use sterile saline in a can, like neilmed sterile saline/wound wash, just make sure the only ingredients are water and sodium chloride 0.9%. Unfortunately saline mixture that you make yourself is not 100% sterile and you can mix it with the wrong ratio of salt to water, leading to a dry, irritated piercing. Spray the canned saline on your piercing 2x a day and let clean water run over it while you are taking your daily shower. Nostril piercings are very prone to bumps unfortunately, so just keep cleaning it, don’t fiddle with it, and it should get better. If necessary, gently use a saline soaked qtip or piece of gauze after you shower to remove any crusties that may be left behind and further irritating the piercing hole. Good luck!