After reading the box that states that Rogaine is only to be used for the vertex area only I'm not sure if I need to return it or not. The top of my head area is where I'm thinning. The vertex area is fine. Will Rogaine 5% solution work for the top of my head area also? I've been told that Rogaine will grow hair on a newborn's butt. Please let me know if I should use the product. Also, what should I expect to happen at first if I start to use it? Thanks