API stands for Application Programming Interface, i.e. API is the way for an application to interact with certain system/application/library/etc. For example, there are API's for OS (WinAPI), API's for other applications (like databases) and for specific libraries (for example, image processing), etc.
Acute HIV infection: The first stage of HIV, known as the primary or acute infection, may cause symptoms of fever and skin rash. This is because the virus is multiplying rapidly in the body and infecting immune cells. This phase generally lasts several weeks.
HIV rash usually causes blotches and spots on the skin, which are red in people with fair skin, or dark purplish in people with dark skin. The spots may be flat or slightly raised, and tend to be very itchy. The symptoms vary between patients - some get a very severe rash which covers a large area, others only have a very minor rash. In most cases, the HIV rash occurs during seroconversion (the time when the infection becomes detectable via blood tests).