Several days ago I noticed these little white bumps on my arms. Mainly from elbow down & are also on top hands, between wrist, thumb knuckle, & index knuckle. The ones on my inner forearms were the color of my skin, but now look like a mix of white & red now. Ones on top of my arm were always white and red. Some of them look like they just dried out and are little red marks now. I can only really see them good in sunlight. Sometimes they are itchy. Any clue what this can be? Can dehydration cause rashes? Dry skin maybe?