How do I fix irregular surfaces enter image description hereI already read some post related to this issue, did what they say but I still having the same problem. As you see in the picture the surface of my mesh has many irregularities (cheeks). I tried fixing quads so I did delete all the cheek area and modeled again but the irregularity still appearing, It is a rigged mesh so I don't think is a problem with doubles. Can somebody help me to fix this ?

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I see one vertex on each cheek with 8 edges going into it, that's just bad modelling. I recommend CG Cookie's tutorial: https://vimeo.com/3835507