A thin border appears around the skin secondary layer's boxes, despite the fact that this layer is completely empty (filled with transparent pixel), except for the nose in the middle of that skin's face, which is on the secondary layer, but not even touching the edges of the "hat" box.
The border seems to blink and move, each pixel appearing and disappearing according to the position of each body parts relatively to the camera.
The border clearly appears on the bottom of the head, in the first image attached. It's seems to be yellow where the hat texture connects to the right arm texture, but black where the pixels are transparent.
I attached the skin file for clarity. It is indeed in the new skin format.
I noticed this with both OpenJDK and the official Oracle JRE, with those versions:
OpenJDK Runtime Environment (IcedTea 2.4.4) (7u51-2.4.4-0ubuntu0.13.04.2)
Java(TM) SE Runtime Environment (build 1.7.0_51-b13)
This is indeed a duplicate of MC-11801, but it should be noted that I'm affected by it since Minecraft 14w04a. It never occurred before.