Do Basal Cell Carcinoma spots disappear? Or are they spots that turn into growths and only increase in size over time? (photo)

I have been having random dry spots on either an arm, leg or lower, lower back above the buttocks. They usually are dry spots. Some are a bit bigger than others in length.However, there's never been an growth per say. And they only ever appear for maybe 2 weeks time and then fade away. The one i have currently looks like a small scar. It was previously red.Its a small spot. I also had one on my top buttocks. That one is now dark and looking like a shaded scars. Possibly psoriasis? They dont itch