Acne vulgaris is the medical name for common acne -- the presence of blackheads, whiteheads, and other types of pimples on the skin. The most common spots for breakouts are the face, chest, shoulders, and back.
Apigee is an API Management tool. If you're interested in API Management systems in general you might find it useful to look at IT Central Station where real users have reviewed many of the options presently available: Best API Management And What Is API Management.
An API (Application Programming Interface) is best thought of as a contract provided by one piece of computer software to another. It's important to note that pieces of software can interact with or without an API. For example: Without API: