Exosomes are small extracellular vesicles that package DNA fragments, several classes of RNA, lipids, and proteins, and are now regarded as active messengers between cells rather than as cellular debris. This narrative review synthesizes dermatologic and related regenerative applications reported between 2020 and 2025, drawing on PubMed and Scopus searches. In skin, exosomes regulate inflammation, angiogenesis, matrix remodeling, pigmentation, and hair cycling. Preclinical models show faster wound closure, improved scar architecture, attenuation of photoaging changes, and stimulation of hair growth, with additional signals in inflammatory dermatoses and fungal skin disease. Early human studies in wound care, rejuvenation, scars, and alopecia suggest acceptable safety and a recurring pattern of benefit when exosomes are used as adjuncts to microneedling, lasers, or standard dressings, although products, dosing, and outcome measures remain heterogeneous. Beyond dermatology, early work in osteoarticular and soft tissue repair points toward meaningful regenerative potential, but clinical programs are still at an early stage. In practice, exosomes are being positioned as acellular alternatives or add-ons to platelet-rich plasma, bone marrow aspirate concentrate, and conventional topicals and as emerging carriers for small molecules and biologics. Key limitations include low yields, product and cargo heterogeneity, lack of agreed quality and potency metrics, and uncertain regulatory status. Whether exosomes remain boutique adjuncts or become part of standard dermatologic and musculoskeletal practice will depend on what happens next: consistent manufacturing, agreed-upon characterization panels, meaningful potency assays, robust pharmacokinetic and biodistribution data, and comparative trials that track outcomes and safety over years rather than weeks.
Grant M. Pham (Sun,) studied this question.