I have red raised blotchy red spots on my legs & they are swollen?

Red Spots on Legs. Red blotches on legs: the emergence of red blotches on legs could be due to many reasons that range from allergies, infections or insect bites and could include several other factors as well such as psoriasis or urticaria or folliculitis. In order to identify the lesions and give a diagnosis, see your local dermatologist.