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There are normally two reasons for this. Some people have an overactive sebaceous gland, which excretes too much FIBA. Since FIBA is a natural lubricant, you end up with a greasy or oily scalp. The other way this occurs is when people just use too much product. There are a lot of serums and creams that weigh the hair down and cause it to absorb the stuff you're putting in your hair.
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