What is a pale white rash somewhat scaly on upper arms?

A pale white rash that is somewhat scaly on the upper arms could be a sign of several different skin conditions. Here are a few possibilities:

* Pityriasis alba: This is a common skin condition that affects children and young adults. It is characterized by round or oval patches of pale, dry skin that are often scaly. The patches usually appear on the face, neck, and upper arms. Pityriasis alba is not contagious and usually goes away on its own within a few months.

* Eczema: Eczema is a group of skin conditions that cause dry, itchy, and inflamed skin. Atopic eczema is the most common type of eczema and it often affects the face, neck, and upper arms. Eczema can be triggered by a variety of factors, including allergies, irritants, and stress.

* Psoriasis: Psoriasis is a chronic skin condition that causes red, scaly patches of skin. It can affect any part of the body, including the upper arms. Psoriasis is an autoimmune disease, which means that it is caused by the body's immune system attacking its own skin cells.

* Tinea versicolor: Tinea versicolor is a fungal infection of the skin. It is characterized by round or oval patches of discolored skin that are often lighter in color than the surrounding skin. Tinea versicolor is not contagious and usually goes away on its own within a few months.

If you have a pale white rash that is somewhat scaly on your upper arms, it is important to see a doctor to get a proper diagnosis. The doctor can determine the cause of the rash and recommend the best treatment options.