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.
Mexico, officially called the United Mexican States, is a country located in North America south of the United States and north of Belize and Guatemala . It has coastline along the Pacific Ocean, Caribbean Sea, and the Gulf of Mexico and it is considered the 13th largest country in the world based on area.