I have had a pimple on my face for two years now. I pop it, it goes down, and then almost immediately comes back up and then I squeeze it, it pops and the cycle continues. I went to a dermatologist who checked it and said it was fine but now I'm worried. It hasn't changed, just comes up, I pop it, it dies down, comes back, I pop it, etc. Should I be worried? I'm 53.