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.
On the equator, the length of day and night are equal every day of the year-day is always twelve hours long and night is always twelve hours long. The Tropic of Cancer and the Tropic of Capricorn each lie at 23.5 degrees latitude.