Where exactly? It should be noted that as you grow up, your genital area and penis will become darker...

Its not because of puberty ....Its just darker in the lefts side of the glans, and only in thats spot the rest is regular color........I was reading about penis cancer....And it says it starts in the glans and im worried it might be that... But I doubt it's that .... I think it might be some other thing...It doesnt hurt when I touch it....Its like really dark blue sort of black

If it's a "dark orange" you need to drink more water, if it's a dark blue or purple, that area might not be getting enough oxygen/blood flow (you should see your doctor if it's #2).

Oh ok.........But it has nothing to do with cancer right???

No, nothing that I could find or know of would suggest that it is cancer related.