Impact of Nipple Reconstruction in Mastectomized Patients Using Cross-Linked Hyaluronic Acid Injection.

* Quantitative Phase * Inclusion Criteria: Women over 18 years of age, or with parental or legal guardian consent. At least one of the following criteria: Women undergoing their first nipple-areola complex (NAC) reconstruction through micropigmentation and/or: No previous neo-nipple surgery, either unilaterally or bilaterally. Surgical reconstruction of the areola. Surgical reconstruction of the NAC with subsequent retraction of the neo-nipple. More than 6 months since their last surgery. \- Exclusion Criteria: Allergy to hyaluronic acid. Poor tolerance to needle injections. Withdrawal Criteria: Participant's voluntary decision. Complications associated with the technique (allergy, hematoma, etc.). Clinical deterioration preventing the woman from continuing in the study. \- Qualitative Phase Participant Profile Characteristics: For the qualitative phase, women who have received NAC reconstruction with HA will be invited to participate, following the maximum variation criterion. To ensure the inclusion of participants with diverse characteristics and capture a wide range of perspectives and experiences on the phenomenon under study, women of varying ages, with different breast cancer diagnoses, and histories of various oncological, surgical, and therapeutic treatments will be selected.