Niacin will cause it but usually a couple minutes after taking at least 250/ 500mg. The buffered Niacin version doesn't cause that affect. Brewers yeast might cause that in some people. A Niacin flush also acts on the pec's, shoulder girdle and neck. What's it good or bad for?...I don't know. It's a rush of blood to the capillaries and gives a redish color to our white or lighter skinned bro's.That sudden flush also causes nerve ending stimulation...itch or like the skin was crawling. One of my best Bud's is from Ireland and he is super white (he probably glows in the dark) with very thin skin. Even warming up he gets red in the upper body/face. Wouldn't think there could be much to do about it (but someone might know) just body type/genetics. Good Luck.
Could it be dry skin?