I stepped on a toy car. a week later, i see a dark painless spot under the skin on my heel. 3 weeks have passed and its still there. help?

Don't worry: It's probably a little hematoma which is blood intrapement under the skin, we'll resolve soon..

Talon noire: French for black her. Skin over bottom of foot especially the heel) is very thick . An injury to the subcutaneous flesh can cause bleeding into this layer of skin . It takes a while for the deep layer to come to the surface and shed.