Allergic reaction?!!?

i have oily skin, but in the last weeks or so i have red spots, which painfull when touch, like a bumps everywhere.and my skin red.i didnt drink or eat anything unsual.in a last year.can be make up?i bough nivea face cream and loreal powder cream.or its can be something to do with the diet.i also have red spots like reaction on my arms where elbow bend sometimes.i do use body cream dove.what can i do?dont know what to eat or drink?bicarbonat of soda somebody told me can clear my sistem.