A 39-year-old woman with HIV presents to the emergency room with a diffuse erythematous rash. She restarted antiretroviral therapy 2 weeks ago with a regimen consisting of darunavir-cobicistat-tenofovir alafenamide-emtricitabine, doravirine, and fostemsavir. She has a prior history of developing a diffuse erythematous rash when taking trimethoprim-sulfamethoxazole. She has no other symptoms and is afebrile. Additional laboratory studies show normal hepatic aminotransferase levels and no evidence of eosinophilia.