Healing brush provides awful results, as does most approaches to bad skin. There are two problems, and the need to be dealt with carefully, unless the "Gumbi" look is what you and the client are after.
Using a non-destructive dodge and burn layer will preserve the skin texture, but diminish the visual impact of the blemishes. They will still be there, but not as obvious. I use two layers, one to diminish the dark tones in the blemishes, and another to dial back the bright tones.
A non-destructive D&B layer is nothing more than a layer, filled with middle gray, with its blend mode changed to overlay. Overlay blend mode is one of the "contrast" blend modes, so middle gray is transparent. If you paint with a white brush, low opacity and low flow (15 and 15 or lowe), you can gradually "lighten" the dark areas, using a tiny brush to pinpoint the action of the brush, and vice versa for using a black brush on things like whiteheads and bright blemishes. Separating the two actions- dodge on one gray layer and burn on the other, makes it easier to edit.
The coloring of a face with bad acne is another challenge. I have had great success with using frequency separation to do this, narrowing the color selection to select all of the red patches and replace the red with a more suitable color, possibly one sampled from another patch of skin that is relatively blemish free.
All of the above is how professional retouchers get the results you see. All the natural skin texture is preserved, but the blemishes are dialed down considerably. Directly editing the pixels is ok for proofs, but not for a final product.
If you don't mind the "gumbi" skin texture - you can run it through Portrait Professional - which does a decent and very fast job at producing better proofs.
You might want to look at this to get some ideas:
http://blogs.adobe.com/jnack/2012/12/demo-non-destructive-burndodge-in-photoshop.htmlhttp://petapixel.com/2013/10/13/photoshop-tutorial-retouching-shiny-skin/http://www.psdbox.com/tutorials/dodge-burning-manipulation-secretshttp://www.webdesignbooth.com/23-professional-facial-photoshop-retouching-tutorials/And this is a completely different "complete" retouch tutorial using yellow channel, smart objects, non-destructive D&B and other pretty effective techniques.
http://www.photoshoptutorials.ws/photoshop-tutorials/photo-retouching/retouch-airbrush-skin-photoshop/