I have been experiencing this for over a year now. No known allergies, it has happened at different times during the day, the year, the geographical area. My fingers will start itching, then start turning red then start swelling. It is random fingers and thumbs. Not all of them at once and not the same ones all the time. This has happened to me even when I am doing nothing but watching tv. It has happened to me in several different states, wearing different clothes washed with different detergents. I have tried changing hair care, detergents, soap ect. It still continues. It happens when I am standing, sitting or walking. I wear no jewelry, so that is not a factor. Sometimes it may just be one finger and other times it is three or four on different hands. It almost never happens when I go run over to the doctors office. Think I am going to go see a nerve doctor and see what that doctor says.