A blood blister forms when skin and small blood vessels are damaged without breaking the skin. Trapped beneath the skin surface is some blood and skin fluid. Blood blisters are commonly caused by accidents in which the skin is pinched by a tool or a heavy weight, or they may occur from constant rubbing back and forth.
1 Sunshine hours in Chicago, Illinois range between 3:42 per day in December & 10:14 for each day in July. 2  The longest day of the year is 15:02 long and the shortest day is 8:57 long.  The longest day is 6:04 longer than the shortest day.
Enjoy The Longest Day Of The Yearâ¦Now They Get Shorter! This is an archived article and the information in the article may be outdated. Please look at the time stamp on the story to see when it was last updated. WEST MICHIGAN (June 21, 2014) â Welcome to the first day of summer! It officially arrived Saturday morning at 6:51 A.M..