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Solution

Sebum is the medical term for an oily secretion from the sebaceous glands in the skin; the latter word can also be an adjective referring more generally to oil or fat; seborrhoea is excessive discharge of sebum from the sebaceous glands; sebacic acid is a white crystalline. It is commonly believed that sebum acts to save skin from drying or to waterproof hair and skin. But some scientists have contended that \"low levels of sebaceous gland activity are not correlated with dry skin\", and it may serve little or no purpose in modern humans. Sebum has no smell, but its bacterial breakdown can produce a bad smell. Sebum is the cause of some people experiencing \"oily\" hair, as in hot weather or if not washed for several days. Earwax is partly composed of sebum. Sebum can be washed using plain detergent, to dissolve the waxy material in the skin. Also, water for washing should be over 84 °F (29 °C) to keep the sebum melted. Excess sebum has been linked to eating red meats, fried and oily foods and some other type of foods but different research shows multiple theories about it.