When the lesions constituting the eruption are of two or more types or characters.
When are lesions said to be aggregated?
When they tend to form groups or closely-crowded patches.
When are lesions disseminated?
When they are irregularly scattered, with no tendency to form groups or patches.
When is a patch of eruption said to be circinate?
When it presents a rounded form, and usually tending to clear in the centre; as, for example, a patch of ringworm.
When is a patch of eruption said to be annular?
When it is ring-shaped, the central portion being clear; as, for example, in erythema annulare.
What meaning is conveyed by the term “iris”?