I have a itchy rush on inner sidw of wrists elbows and top of my torso. It is hardly ever in all mentioned spots at the same time. Would it be allergy?

Rash. The rash could be due to anything from contact dermatitis skin irritations, eczema, certain skin infections or psoriasis. With out a thorough history and exam it is difficult to assess. You should see your pcp or dermatologist for further evaluation and management.