You may have seen some smoke, cloud thing in the area you would not interact with yet. You need a certain ability to find it. A ability that can track senses. I hope this helps, feel free to ask if you still have trouble with it!
You need to buy the piece of land (Forest Home) from the store in the eastern part of town as well as the lake expansion. Visiting that small lake, you can bath there and have the option to use the Shampoo.
