I have a small blackish bump on my leg, it has a red ring around it, and i am not sure if it is a mole or not. what is it and what should i do?

See a dermatologist!: Any time there is a pigmented lesion (one with color), and sometimes even a non-pigmented lesion, it is necessary to have them examined by a dermatologist. The red ring could simply indicate inflammation but the fact that it may be new to you or is a changing lesion is a real indication to have this examined by a professional.

Agree with Dr. T: Unless it is a recent lesion it would be prudent to see a dermatologist. If it is a recent lesion, what you described could be from an insect or tick bite, in which case it would still require evaluation by physical examination. You may wish to start with your primary care provider and let her/him figure out if you need to see a specialist.