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 significant to understanding the Earth's geography because it marks the southern boundary of tropics. This is the region that extends from the equator south to the Tropic of Capricorn and north to the Tropic of Cancer.io de Janeiro lies on the Tropic of Capricorn, which is at about 23.5 degrees south latitude, in the Southern Hemisphere.