I had a small lump near ear bone, just next to the sideburn. Ive had this lump maybe a year and sometimes the lump did decrease in side but most of the time it stayed the same size. it doesnt hurt or anything but then today i noticed that on the lump there is a dark black mark on the lump. It was a black dark round mark on the lump, it still doesnt hurt or anything. Should i be worried? why is there suddenly a dark black mark on the lump?