In mathematical analysis, a measure on a set is a systematic way to assign a number to each suitable subset of that set, intuitively interpreted as its size. In this sense, a measure is a generalization of the concepts of length, area, and volume.
Corticosteroids are steroid hormones that are either produced by the body or are man-made. Systemic corticosteroids refer to corticosteroids that are given orally or by injection and distribute throughout the body. It does not include corticosteroids used in the eyes, ears, or nose, on the skin or that are inhaled, although small amounts of these corticosteroids can be absorbed into the body.
Corticosteroids are considered to be acnegenic comedogenic drugs, and it would make good sense to make every effort to avoid using them in patients with current acne or a tendency to develop it. In a word, corticosteroids are essentially contraindicated in acne-prone patients.