xrichx saidSounds like OP might be overtraining a bit. Although overtraining won't increase the "skinny fat", it could hinder progress and make it more difficult to loose that extra flab.
However, from looking at his pics, I don't see the "skinny fat" at all.
I totally agree. OP's body type is very similar to my own only it will take me another 12 months (guessing) to get where he is in terms of muscle/fat ratio.
In answer to your question *as stated* OP, the answer has to be a resounding "NO!". It isn't "too much cardio" that causes "skinny fat". (ETA: The *cause* of "skinny fat" is genetic predisposition coupled with the wrong diet and energy expenditure for the body type.)
What is a concern here is your stated "obsession" with this concept. From your pix you are doing great! There is clearly muscle development under your skin *and* you do not have a protruding belly (like I struggle with). Maybe you need to hear that from some outside sources.
I suspect you want to look 'cut' which you probably can if you go through some sort of cutting cycle. HOWEVER, I also suspect that where you are now is pretty much where you *ought* to be from a genetically healthy body perspective (as opposed to an under 10%BF, fitness-media vanity body-image perspective).