Red and blotchy skin could be a number of issues. The first one I think of it eczema. Eczema is inflammation of the skin. It could hereditary or caused by the environment like an allergy. The blotches are itchy. The best thing to do is use non irritating cream and if you are having a reaction to something, try to avoid it.
Another reason for red and blotchy skin could be hives. Hives are usually caused by an allergic reaction to something. It could also accompany diseases like the common cold. However, it is mostly caused by an allergic reaction. It depends on the type of blotchy and red skin you have and if it is itch or not. If you want to find out more, try to put your symptoms in Google and see what comes up.
Another reason for red and blotchy skin could be hives. Hives are usually caused by an allergic reaction to something. It could also accompany diseases like the common cold. However, it is mostly caused by an allergic reaction. It depends on the type of blotchy and red skin you have and if it is itch or not. If you want to find out more, try to put your symptoms in Google and see what comes up.