The present invention relates to the cosmetic use of an extract of Khaya senegalensis obtained by aqueous extraction to maintain and / or increase the expression of collagen XVIII in the skin and / or the mucous membranes and / or the scalp and / or the appendages to maintain and / or increase the firmness and / or elasticity of the skin and / or the mucous membranes and / or the scalp and / or to reduce the visibility of the cutaneous pores and / or to make the skin smoother and / or to limit and / or reduce perspiration and / or limit and / or reduce hair and / or hair loss and / or increase hair and / or hair growth and / or reduce or limit sebum production. The present invention finally relates to a cosmetic care process comprising the application of an extract of Khaya senegalensis or a cosmetic composition comprising it for maintaining and / or increasing the expression of collagen XVIII in the skin and / or the mucous membranes and and / or the scalp and / or the cutaneous appendages, to maintain and / or increase the firmness and / or elasticity of the skin / or the mucous membranes and / or the scalp and / or to reduce the visibility of the cutaneous pores and / or to make the skin smoother and / or to limit and / or reduce perspiration and / or to limit and / or reduce hair loss and / or hair growth and / or increase the growth of hair and / or hair and / or or reduce or limit the production of sebum. La présente invention concerne l'utilisation cosmétique d'un extrait de Khaya senegalensis obtenu par extraction aqueuse pour maintenir et/ou augmenter l'expression de collagène XVIII dans la peau et/ou les muqueuses et/ou le cuir chevelu et/ou les annexes cutanées, pour maintenir et/ou augmenter la fermeté et/ou l'élasticité de la peau et/ou des muqueuses et/ou du cuir chevelu et/ou pour diminuer la visibilité des pores cutanés et/ou rendre la peau plus lisse et/ou pour limiter et/ou réduire la transpiration et/ou limiter et/ou réduire la chute des
