Ouch! There's probably not much you can do to conceal it. You could use a bandage, but that's going to draw attention to your scalp as well. I wouldn't worry about it too much in regards to the lady. It will give you a story to share with her.
In regards to healing, I recommend Neosporin or something similar. Make sure you keep it clean. You'll probably want to wear a bandage at work.