Skin Cancer???

So, I have had this spot on my arm for a couple of weeks. No big deal except it is the same arm I had a severe sunburn on last year. I can't seem to leave it alone. I have this nervous habit of picking at things. I keep picking it off and it scabs over and then I pick it again. i finally called the doctor today and the nurse thought it would be best to make an appointment just in case. I knew what she meant? My doctor appointment isn't for two more weeks. I hope in that time it goes away and then i won't have any worries.