Hi, I have gone through your query. As you are already diagnosed with Eczema, that white stuff may be flakes due to dryness. Actual cause of Eczema is unknown and steroids are used to treat it. Local application on ointment containing steroid like clobetasol is used. For itch antihistamines like loratidine can be used. Avoid drying of the lesion by using moisturizing creams. Keeping the affected area moistened can promote skin healing and relief of symptoms. Maintain proper hygiene of the area. Do consider a positive feedback as a credit to my work. Let me know if you have any further questions.