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 is mainly caused due to an underlying infection by the HIV virus. It can also develop as a side effect to the intake of medications that are used to treat and manage the symptoms of the infection. The rashes typically do not spread via direct contact and hence are non-contagious.