It seems that the HTML5 element figure adds some margin/padding if there is an image inside it. If you add a border around the figure you can see a small padding inside the element.
<figure>
    <img src="image" alt="" />
</figure>
I reset all the margins and paddings with CSS by writing * { margin: 0; padding: 0 }
Anyone know how to handle it? Please take a look at this fiddle: http://jsfiddle.net/74Q98/
It's not a <figure> bug - it's a normal behavior of the <img> element
To fix it try this - DEMO
img {
    border: 1px solid green;
    display: block;
    vertical-align: top;
}
UPDATE
By default any image rendered as inline (like a text), so the little extra space underneath is the space that all text lines have (i.e. for q, p etc.) 
The above answer combines 2 methods of fixing the issue. So basically you can use just one of those:
img { display: block; }
or
img { vertical-align: top; }
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