AR if your bump map is not showing in the skin's material, you can add it at the materials editor, go to the bump map and select bitmap, then go to where you have stored select it and voilthat's all, maybe you will going to need to change the value, Max alwas use a 30 % as the default value for a bump map, play with that value and use what you like it better.

SAL9000 - Hello Dr. Chandra, Will I've dream?