Skin Barrier Function and Inflammation in Aging: The BIA Study

Inclusion Criteria 1. Male or female ≥ 70 years of age at the baseline visit. 2. Diagnosis of xerosis cutis based on an Overall Dry skin (ODS) score of =\> 1 for any body site where patients will be asked to apply moisturizer (i.e. arms, legs, buttocks, front of trunk). 3. Written informed consent (and assent when applicable) obtained from subject or subject's legal representative 4. Ability for subject to comply with the requirements of the study. Exclusion Criteria 1. History of inflammatory skin disease (e.g. psoriasis, atopic dermatitis, or bullous pemphigoid) that has been active in the past 10 years. 2. History of contact dermatitis to moisturizers. 3. History of chronic inflammatory conditions (such as cancer, arthritis, inflammatory bowel disease, or coronary artery disease). Participants with a history of localized skin cancer will not be excluded. 4. Current infection. 5. Open skin wounds. 6. Physical limitations or lack of a caregiver preventing application of a moisturizer to skin on the trunk and extremities. 7. Current use of topical medications, oral systemic immunomodulatory treatments, or anti-microbial treatments. 8. Diagnosis of primary or acquired immunodeficiency. 9. Use of skin moisturizer less than 1 week prior to enrollment visit, with the exception that participants may use non-study moisturizer/sunscreen on face, if used consistently throughout study period. 10. Inability to give informed consent. 11. Presence of a condition or abnormality that, in the opinion of the Investigator, would compromise the safety of the patient or the quality of the data. 12. If the participant does not meet all the above criteria, he/she will not be eligible for study participation.