This is a Photoshop .jsx script that will iterate & change a number in a text layer, and save-to-web files in a preset path.

Iterate text layer, save to png

function sfwPNG24(saveFile){
  var pngOpts = new ExportOptionsSaveForWeb; 
  pngOpts.format = SaveDocumentType.PNG
  pngOpts.PNG8 = false; 
  pngOpts.transparency = true; 
  pngOpts.interlaced = false; 
  pngOpts.quality = 100;
  activeDocument.exportDocument(new File(saveFile),ExportType.SAVEFORWEB,pngOpts); 
}

/*
Incrementing a number inside a text layer then Saving it in PNG
*/

var layer = activeDocument.layers[0];
var filePath = '~/Documents/Pictures/'; // your file path here
var fileNamePrefix = 'icon-pin-';

/* I'm having problems with PS shrinking the font size as it runs through the script. Hardcoding it for now. */

if (layer.kind == 'LayerKind.TEXT') {
  for (var i=1; i < 100; i++) {
    layer.textItem.contents = i.toString();
    layer.textItem.size = 32;
    sfwPNG24( filePath + fileNamePrefix + i +'.png');
  };
};