| abstract |
A means for improving rough skin of a person with sensitive skin is provided by including a sphingosine compound having a basic structure represented by the following formula (3) or (4) in a skin external preparation. (In the formula, R1 represents an amino group or the like, R2 represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms having a hydroxyl group, and R3 and R4 each independently represent a hydrogen atom and a hydroxyl group, or R3 and R4. Represents a combination of oxygen atoms having the same, R5 represents an alkyl group having 1 to 8 carbon atoms, etc.) (In the formula, R1 represents an amino group, R3 and R4 each independently represents a hydrogen atom and a hydroxyl group, or a combination of oxygen atoms in which R3 and R4 are the same, and R5 represents an alkyl having 1 to 8 carbon atoms. Represents a group, etc.) |