Hi, thanks for your query. You keep getting itchy rash in your chest which may be eczema, fungal infection, conact dermatitis Since your skin doctor has diagnosed it as eczema ,I would go with him as he has examined it visually. It can be confirmed by a skin biopsy . Since it is present for more than a year chronic scratching can lead to pigmentation and thickening of the involved skin. Most important part of treatment is to break the scratch itch cycle by avoiding scratching scratching and use of oral anti histaminics regularly for two weeks, especially before you go to bed. You may get in touch with your doctor for prescription medicines in the form of topical and oral steroids if required. Hope this helps you.