Hi all

Hope someone can help me with this problem of mine.
Every since I've started to work out (about 2 years ago), I've grown some meat om my arms but also some unwanted achne/red dots on my arms.

I have no idea what they are or are called. They don't don't do any harm or itch, it just doesn't look good...
I think it's some kind of chemical reaction due to protein intake or growth, but these things should go away naturally right?
In the beginning I started to take chocolate protein shakes, but have later on switched to another brand. So it can't be the chocolate flavor (I've heard that chocolate makes acne grows).

Please help!