I Have A Light Brown Mole That Turned Dark Black

I have a light brown mole that turned dark black for a couple weeks but now has turned back to brown. I do have an appointment but is not for a couple of weeks and it is bothering me not to know what is going on. I also have two smaller type moles real close together that appeared, became agitated a couple months ago - I thought they were bug bites but stuck around. They seemed to clear up but then a couple weeks ago became agitated again - red, itchy. All of these are on my back.