Hello, i have rash patches on my arms and legs that are very dry. there was one but now there's more.

Doctor can examine: Rashes are hard to describe in words. Usually, a doctor has to look at a rash to see what it might be. For common rashes such as eczema, mild reactions to plants or chemicals, excessive dryness, or little itchy bumps, over-the-counter hydrocortisone 1% cream usually helps. Bumps on a large number of body parts might be an allergic reaction to something or from other causes.