On the Origin of Imaginary Species

Those of you with young kids have, I'm sure, been subjected to the evil that is "Yo Gabba Gabba".  It's an award-winning show based on the educational antics of a bunch of freaky-ass puppet things who live in the suitcase of a D.J.

Anyway, they had one episode where the family of one the main characters, Muno, comes to visit.  Muno's parents and his siblings were in it, and aside from color there's one prominent feature that distinguishes them from one another:

Let me help you out here.  The red one on the right is male.  The pink one on the left is female. 

I can only assume those bumps that look like small spheroid shapes just below the skin are...well....I'm pretty sure it's not acne, know what I mean?