Yes, dry eczema can spread. If the skin remains dry and is not properly cared for, the existing rash may expand, or new rashes may appear on other parts of the body. It is recommended that you increase daily moisturizing, avoid scratching, and consult a doctor promptly.

Specifically, the spread is usually associated with the following:

1. Persistent damage to the skin barrier. If the skin is dry and lacks protection for a long time, its ability to retain moisture and its defense capabilities will decrease, making it more susceptible to inflammatory reactions in more areas.
2. Improper scratching. Scratching an existing rash can worsen local inflammation and may spread the inflammatory response to the surrounding skin, or even carry trace amounts of irritant to other areas through the fingernails.
3. Incomplete care. If only the area with a rash has been treated, while the moisturizing and protection of the entire body's skin is neglected, other dry areas are more likely to develop new eczema.
To help control the situation, you can take these targeted measures: apply a sufficient amount of gentle moisturizer every day, especially immediately after showering when your skin is still slightly damp; wear loose, soft cotton clothing to reduce friction; avoid showering in excessively hot water or for extended periods; if the rash spreads or increases in number, seek medical attention promptly and use medication under professional guidance.