When I work with others on skin issues, I rarely place focus on the skin issue directly. The skin issue is merely a symptom of unresolved emotional conflicts.
Acne is most commonly linked with not approving of ourselves, not allowing ourselves to express our individuality. There are often many sexual fears and fear of intimacy too and also a feeling of powerlessness over choices we make (because we seek others approval as opposed to our own)- So, see Acne as a form of self defence mechanism, protecting ourselves from the above fears.
You might also want to consider where and why you feel embarrasement in yourself.