What Causes A Red Spot On The Abdomen?

i've had a red spot about the size of a quarter on my stomach for a few weeks now. It doesnt itch. Ive used antibacterial ointments, but those dont seem to reduce its size. Also, i let it dry out, which makes ir scaley. But as sson as i apply lotion, the spot raises more and is a brighter shade of red. Any ideas?