Hyposeborrhoea (lack of sebum)
We speak of hyposeborrhoea when the sebaceous glands do not produce enough sebum, making keratin less elastic. The scalp becomes fragile, more vulnerable to irritation, hair dry, brittle and often forked, and the affected person may feel discomfort and itching. When there is lack of sebum, the skin and hair become more sensitive to all external aggressive agents because they suffer from dehydration. An other quite normal cause of hyposeborrhoea is the aging, both skin and hair lose luster because of the progressive dehydration.