My gums are red in certain places. Is it gum disease?

[HealthStatus]

Hello! Can anyone please help me with my problem? To start off, I'm 20 years old and I think I could have gum disease although I knew it usually starts much later in life. Nobody in my family has any history of periodontitis or any issues aside from some cases of trauma induced tooth loss. I've had an appointment back in December for a tartar removal and my dentist noticed some localized inflammation of my gums. He said it's nothing too bad and it should heal, however my gums are still red in those areas to this day:

My gums don't bleed at all when I'm brushing. I don't floss but I use mouthwash and interdental brushes and I brush my teeth twice a day.