The problem known as oily hair is actually the scalp getting oily. This problem which is caused by production of sebum by the skin causes the hair to appear oily. In individuals with smooth hair the oil secreted in the scalp diffuses to the hair rapidly during the day, but this problem is less remarkable in individuals with curly hair.

Excessive oil leads to hair loss, increase in the number of a species of fungus (pitrosporium) which is present in the scalp, dandruff and eczema (seborrheic dermatitis) and inflammation. Therefore, prevention of excessive oil in the hair is very important in terms of healthy hair and scalp.