I have these red circles on my legs, and my moms worried that it might be cancer, because skin cancer and breast cancer runs in my family. I am only 15 and I am really worried. They don't itch or burn or anything they're just there. Helpful tips? Please(:

Can you identify them any better then just as circles? The reason Im asking is because if this is something that has suddenly appeared then you could have a skin condition commonly called ringworm. It is not a physical thing such as a worm it is a fungus that can grow on the skin. Its most commonly on animals and can be transferred to humans. Here is some pictures of it and a little about it.

Ringworm (Tinea) Treatment, Pictures, Causes, Symptoms and Diagnosis by MedicineNet.com