Hi-
a couple nights ago I had a couple beers with dinner. I have been known to get red blotches on my chest when I drink, but this time, the blotches did not go away the next day. The blotches on my chest went away, but they stayed on my back, and now they are darker in color. They aren't purplish/red, just about two shades darker than my normal skin color. It doesn't itch, and I feel fine.

Is this an allergic reaction? Will I be spotted forever? Someone help!