I also use tape. And have it pretty much perfected to where it doesn't hurt me, only time im not wearin it is if im in the house or sleeping.
As far as those lumps go, are you outside the skin or in? like, can you feel it just on the SKIN? I get cysts (genetics) and get lumps too. Little ones, hard. And I'm pretty sure it's from binding (done it for a good 5-6 years). But if you're worried about it, get it checked out. When I go to the doctors I just use a ace bandage, it's easy to take off, and easy to put back on. Doctors have seen a LOT of stuff dude, don't be embarassed. Plus, they don't stay in the room when you're undressing into the gown, unbind then, and bind back up when they leave to let you get dressed.
Tell your mom you don't need her holding your hand in the doctors office. You're not 5. Tell her she can go ahead and wait for you in the lobby.