Excessive sun exposure is a common cause of brown spots on the scalp due to conditions such as melasma and actinic keratosis, per the Mayo Clinic and the American Academy of Dermatology. While these conditions differ slightly from each other, they both are frequently caused by excessive ultraviolet radiation. Continue Reading.
Mexico is a part of North America. Maybe you are thinking of Northern America, which is a tricky area as sometimes Mexico is included and sometimes it is not. Northern America â¦ is the northern portion of North America, in which Canada and the United States are usually the two sole members.
What is the population of Michoacan Mexico? Where is the country of Mexico located?   Mexico is located in the northern hemisphere, directly south of United States of America and north of Guatemala and Belize. It is bordered on the west by the Pacific Oceâ¦an and has the Gulf of Mexico on its eastern coast.