Hello, I Got My Daith Pierced Two Days Ago And

Hello, I got my daith pierced two days ago and yesterday I felt behind my ear and on the bone (which I believe is the mastoid) I have a small pea sized hard lump that doesn't move and is painless. I've been very concerned about it because I'm only fourteen and I have a huge fear of bad health condition. I talked to my mom about it and she felt the lump and she thinks it's just a swollen gland due to my body trying to heal the fresh piercing. Any help would be amazing right now, thank you!