Check with a doctor, because even though there is no pain there you could still have an infection which might hurt you, before you know you have it. Watch your toe, for fever, redness, swelling, and other sign's of a problem. Usually turning black mean's the toe nail want's to, or is going to fall off. If it is your toe, and not the toe nail you really should see someone, because you could lose your toe or more upward than just the toe. Also there is a thought of gangrene although I'm not sure what to look for. I know how, and what it is, and look's like, but I haven't seen your toe so I cannot say.