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.
When used in the context of web development, an API is typically defined as a set of Hypertext Transfer Protocol (HTTP) request messages, along with a definition of the structure of response messages, which is usually in an Extensible Markup Language (XML) or JavaScript Object Notation (JSON) format.