Here’s a new 30-second hack for you:  Get rid of those pesky tanlines using the healing brush (the second option down in the healing brush menu) on DARKEN mode. Sample the skin tone you want by pressing the Alt key (PC) and clicking on the tone you want, then paint that tone onto the problem area. The skin will darken and shift color without losing any texture.  Quick and easy!  Now, I’ve used any number of methods for this before:  patch tool, content aware patch tool, paint with luminosity, clone brush on darken, etc.  But this is the quickest way I have found to get it done well in a short amount of time.  Feel free to share!