Provided are: particularly a composition for enlarging the breast, which comprises a composition for promoting the increase in a subcutaneous tissue, wherein the latter composition enables the recovery of an autologous tissue or the recovery of physical appearance through such a safe and natural method that an adipose tissue is formed and increased around a mammary gland to accumulate and increase the adipose tissue under the skin of the breast； and a breast enlargement method. A composition for promoting the increase in a subcutaneous tissue, particularly a composition for enlarging the breast, which is characterized by comprising self-derived plasma and a basic fibroblast proliferation factor (b-FGF)； a composition for enlarging the breast, which comprises the above-mentioned composition for promoting the increase in a subcutaneous tissue, wherein the composition additionally comprises a fat, specifically a composition for enlarging the breast which comprises the above-mentioned composition for promoting the increase in a subcutaneous tissue, wherein the fat has the form of a fat emulsion and the fat emulsion has the form of an oil-in-water-type fat emulsion that is produced by emulsifying an oil or fat in the presence of an emulsifying agent； a method for enlarging the breast, in which the composition is used； and a unit for injecting the composition for enlarging the breast.L'invention concerne particulièrement une composition servant à augmenter la taille du sein, qui comprend une composition pour promouvoir l'augmentation dans un tissu sous-cutané, dans laquelle cette composition permet la récupération d'un tissu autologue ou la récupération de l'aspect physique à travers un procédé naturel et sans danger où un tissu adipeux est formé et augmenté autour d'une glande mammaire de façon à accumuler et à augmenter le tissu adipeux sous la peau de la poitrine ； et un procédé d'augmentation du sein. Une composition pour la promotion de l'augmentation dans un tissu s
