In the skin aging process, both intrinsic alterations, secondary to cell regeneration capacity loss resulting from chronological action, and extrinsic alterations, caused by to ultraviolet radiation exposure, can be observed. Treatments that restore collagen production and stimulate fibroblasts to synthesize and organize extracellular matrix are critical for morphogenesis, angiogenesis, and skin healing. Potential uses of products that stimulate collagen production, a component that plays a fundamental role in the extracellular matrix, represents a promising perspective for improving skin quality and its mechanical properties by introducing a new concept of therapeutic approach when treating changes caused by skin aging.

Keywords: Collagen; Hydroxyapatite; Skin Aging

INTRODUCTION: For religious reasons, a portion of the population does not expose their body, showing only the feet.
OBJECTIVE: This study aimed to meet the demand for treatments to rejuvenate the dorsum of the foot, observe the safety of using calcium hydroxyapatite and its results, and discuss the region anatomy.
METHODS: Sixty women with an average age of 63 years and skin phototypes from I to VI had the dorsum of their foot's age classified by types from I to VII, and were injected with 0.75 ml to 3 ml of calcium hydroxyapatite per patient in this region, in a single session. A dermatologist who did not participate in the treatment and the patients conducted the evaluation through photos.
RESULTS: The results were considered good to very good depending on the aging stage of the dorsum of the feet. Complications were limited to local edema and erythema. Follow-up lasted from six months to one year.
CONCLUSION: The injection of calcium hydroxyapatite into the dorsum of the feet, based on knowledge of the anatomy of this region and correct volume, could be considered a body area treatment.

Keywords: Calcium Hydroxyapatite; Foot; Anterior Compartment Syndrome; Collagen