Hello, I had couple questions on acne and the treatment. I have always had good skin. I would sometimes get acnebut it used to go away in few days including the red spot. But since few years ago, the red spot would not disappear. I was wondering if there was something wrong with me internally but several blood test indicated that I am healthy. Is it normal that the red spot doesn't disappear suddenly? Also, can I apply treatment and moisturizer only on the spot where I have acne?

I would really appreciate some feedback. Thanks!