It consists of a papule from which the contents are not easily expressed. When inflamed these lesions form pustules and nodules. The open form of comedo, called a blackhead, is rarely inflamed. It has a dilated opening from which the oily debris is easily expressed.
The Tropic of Capricorn is the circle marking the latitude 23.5 degrees south where the sun is directly overhead at noon on December 21, the beginning of winter in the northern hemisphere.
The Tropic of Capricorn is the parallel latitude indicating the extreme southern global positions at which the sun appears directly overhead at noon. again, the sun only reaches this position once a year, at the Summer Solstice of the Southern Hemisphere (ie. the Northern Winter Solstice).