The present invention relates to the cosmetic use of a Khaya senegalensis extract, obtained by aqueous extraction, for maintaining and/or increasing the expression of collagen XVIII in the skin and/or the mucosae and/or the scalp and/or the skin appendages, for maintaining and/or increasing the firmness and/or the elasticity of the skin and/or the mucosae and/or the scalp and/or for reducing the visibility of the skin's pores and/or making the skin smoother and/or for limiting and/or reducing perspiration and/or limiting and/or reducing loss of head hair and/or body hair and/or increasing the growth of head hair and/or body hair and/or reducing or limiting sebum production. Finally, the present invention relates to a cosmetic care method comprising the application of a Khaya senegalensis extract or of a cosmetic composition comprising same, for maintaining and/or increasing the expression of collagen XVIII in the skin and/or the mucosae and/or the scalp and/or the skin appendages, for maintaining and/or increasing the firmness and/or the elasticity of the skin and/or the mucosae and/or the scalp and/or for reducing the visibility of the skin's pores and/or making the skin smoother and/or for limiting and/or reducing perspiration and/or limiting and/or reducing loss of head hair and/or body hair and/or increasing the growth of head hair and/or body hair and/or reducing or limiting sebum production.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 cheveux et/ou des poils
