If you have scalp eczema, immediately discontinue using any hair products with fragrances or harsh chemicals until you know that they do not trigger your condition. Switch to a mild, fragrance-free, tear-free baby formula, use a mixture of warm water and baking soda, or just plain warm water to cleanse your hair until you can see a professional and begin a treatment plan. Depending on the cause of your condition, washing more or less frequently may be recommended for your specific condition.