Amount matters! If you have put too much into your hair for extended periods without washing, it can lead to clogging the pores on your scalp and create buildup, leading to an itchy scalp. If you have fine hair, overusing coconut oil without washing it out can also leave your hair looking oily and greasy. Everyone reacts differently so it is a good idea to trial and error using different amounts and duration to get the most benefits for your hair.