LIPM (lipase family member M) is a lipase enzyme with a highly specialized role in keratinocyte differentiation and epidermal lipid metabolism. Based on its gene ontology annotations, LIPM possesses lipase activity and participates in lipid metabolic processes, cornification, and functions in the extracellular region with lipoprotein lipase activity. The protein plays an essential function in lipid metabolism within the most differentiated epidermal layers, suggesting a critical role in maintaining the barrier function and structural integrity of the stratum corneum during the final stages of skin cell maturation. Beyond its primary epidermal function, LIPM expression is modulated in inflammatory contexts. In fibroblast-like synoviocytes exposed to IL-1β—a key inflammatory cytokine in osteoarthritis—LIPM was significantly upregulated alongside other arthritis-related genes, indicating involvement in inflammatory lipid metabolism 1. This upregulation occurred in the context of NF-κB and cytokine/chemokine signaling pathway activation, suggesting LIPM may contribute to lipid-mediated inflammatory responses. The clinical significance of LIPM remains incompletely characterized. Its dysregulation in inflammatory joint disease models suggests potential relevance to osteoarthritis pathogenesis, though direct causal relationships require further investigation. Current evidence supports LIPM as a specialized lipase regulating both normal epidermal homeostasis and inflammatory lipid metabolism, with emerging implications in joint inflammation.