Darker area on penis glance (pictures)

So about 4 months ago I noticed a black (darker then the rest of the penis) area on penis glance. It doesn't hurt or burn or anything else, it's not lifted above the level of the rest of the penis glance (it's not elevated), when i press it and it goes white like the skin normally would. It's not spreading (I think). So i need to know could it be somethign malignant or dangerous? Im 17 I haven't had a sexual relationship yet so It can't be STD. Please only answer if your are more than 70% sure.
Links:

http://postimage.org/image/215bf40h0/
http://postimage.org/image/yxbvd0x0/
http://postimage.org/image/yz9bxlno/
http://postimage.org/image/z01g2i1w/