There's only one answer...get it looked at ASAP. Either it's nothing to freak out about or it is. If it is, early treatment is LOTS more successful than late treatment. When you see the doctor, try to have someone with you, a close friend, significant other, or family member. They can ask questions you may not think of, and remember things the doc says that you wont. If the news is bad, they are there for emotional support ( I dont care what you say now, you WILL be glad they are there if the news is bad) and if the news is good, you have someone to celebrate over lunch with.
Good Luck.