Gino Cordone

Hello, new to the forum, I had some questions about white ink. I got a black and grey half sleeve in 2 sessions last year. September and December. I got some white highlights that have seemed to never heal properly. Some spots are red and raised, while others are normal looking. It's been 6 months since my second session and I still have raised spots. Is this normal? I went back to the shop after my first session and they were like yeah that's fine, nothing to worry about. I've included some pictures. Thanks for any input!