What is a rash that dry patchy spot clear and turns the skin white?

The rash you described could be a sign of several different skin conditions. Here are a few possibilities:

1. Pityriasis Alba: This is a common skin condition that typically affects children and young adults. It is characterized by dry, scaly patches of skin that are usually white or pale pink in color. The patches are often found on the face, neck, and upper extremities. Pityriasis alba is usually harmless and will clear up on its own within a few weeks or months.

2. Eczema: Eczema is a general term for a group of skin conditions that cause inflammation, redness, and itchiness. There are several different types of eczema, and the symptoms can vary depending on the type. Atopic dermatitis is the most common type of eczema, and it often affects children. It can cause dry, scaly patches of skin that are red and itchy.

3. Ringworm: Ringworm is a fungal infection that can affect the skin, scalp, or nails. It is characterized by red, itchy, circular patches of skin that may have a raised border. Ringworm can be spread through direct contact with an infected person or animal, or through contact with contaminated objects.

4. Vitiligo: Vitiligo is a skin condition that causes white patches of skin to appear on the body. It is caused by a loss of pigment-producing cells in the skin. Vitiligo can affect people of all ages and skin types.

If you are concerned about a rash on your skin, it is important to see a doctor for a diagnosis. The doctor can determine the cause of the rash and recommend the best course of treatment.