Just a few days ago I noticed a small scab on the crease of my skin where the armpit meets the back. It is in an awkward position so that when I lift or bend my arm I can feel it. It appears to have gotten larger within the days. I don't remember being cut or scratching myself, although it does resemble a cigarette burn but hasn't pussed or healed like one would. It is the only sort on my body and will just not go away. It doesn't itch, but when I move a certain way it slightly aches so I know its there. I do get dry skin in the winter, but not like this.