Let's explore the multifaceted applications of methylene blue (MB) in medicine. One research paper investigates MB's efficacy in conjunction with doxorubicin for treating oral squamous cell carcinoma, demonstrating enhanced apoptosis in vitro. Another systematic review examines MB's use in antimicrobial photodynamic therapy (aPDT) for infected skin wounds in animal models, revealing its effectiveness despite variability in treatment parameters. A third systematic review focuses on MB's role in anticancer photodynamic therapy across various animal cancer models, highlighting its efficacy against several cancers while noting inconsistencies across studies. A final paper details the development and in vitro testing of MB-loaded liposomes for enhanced photodynamic therapy against various cancer cell lines, showing improved cellular uptake and toxicity compared to free MB.