What Are The Raised Bumps On The Tattoo?

I got a professional tattoo 16 days ago. This is my 7th tattoo and have never had trouble before. Sometimes a previous one's black outline raises, but no rash, swelling etc. I'm beginning to think that I am experiencing a delayed hypersensitivity reaction, but want to make sure it's not Staph. Are there any definitive ways I can differentiate or should I see a doctor?