Your piercer is the first stop for almost everything: irritation bumps, crusting questions, jewelry that feels wrong, 'is this healed yet'. Reputable studios expect these visits, handle them free, and can spot the cause — a too-short post, a sleep habit, an angle problem — in seconds. Go back to the studio before you go down an internet rabbit hole.
Escalate to a doctor for the infection signs: spreading redness, escalating pain, heat, fever, or thick discolored discharge. That is a medical situation, not a piercing-technique one. For everything short of that, patience plus saline plus a piercer's eyes solves the overwhelming majority of healing problems.
And if a piercing simply will not settle after months of clean aftercare, listen to it. Sometimes the anatomy or angle was wrong from day one, and the brave move is letting a piercer retire it and re-pierce correctly later — a few months of reset beats years of a piercing that never stops being angry.