What should I do about white flakes appearing on the chest?
White flaking on the chest is generally caused by factors such as dry, dehydrated skin, improper cleansing methods, xerotic eczema, seborrheic dermatitis, or psoriasis. It is recommended to seek timely medical attention, identify the underlying cause, and then improve the condition under a doctor's guidance through general care, medication, and other treatments. A detailed analysis is as follows:

1. Dry, dehydrated skin: In dry climates or when fluid intake is insufficient, the stratum corneum of the chest skin loses moisture, leading to epidermal shedding and flaking, often accompanied by a tight sensation. Increase daily water intake, apply moisturizers such as vitamin E lotion or petroleum jelly-based creams immediately after bathing, and wear gentle, moisturizing clothing to reduce friction.
2. Improper cleansing: Frequent use of strongly alkaline body washes or washing the chest with excessively hot water can damage the skin barrier and trigger flaking. Discontinue using irritating cleansers immediately. Switch to mild, slightly acidic body washes, keep bath water temperature between 37–40°C, and limit each shower to no more than 15 minutes.
3. Xerotic eczema: When the skin barrier is compromised and exposed to external irritants, inflammation occurs, presenting as pale red patches with fine flakes and itching. Follow medical advice to apply topical medications such as hydrocortisone cream, desonide cream, or mometasone furoate cream. Avoid scratching and maintain indoor humidity levels between 40% and 60%.
4. Seborrheic dermatitis: Inflammation caused by excessive sebum production leads to light brown patches on the chest covered with greasy scales, accompanied by mild itching. Patients should use medicated products such as ketoconazole shampoo, selenium sulfide shampoo, or bifonazole solution as prescribed. Maintain a light diet low in sugar and fat, and avoid staying up late to ensure regular sleep patterns.
5. Psoriasis: Immune dysfunction causes abnormally rapid skin cell proliferation, resulting in well-demarcated red plaques on the chest covered with thick, silvery scales, along with varying degrees of itching. Use medications such as calcipotriol ointment, tacrolimus ointment, or halometasone cream as directed by a physician. If necessary, narrowband UVB phototherapy may be used, which employs specific wavelengths of ultraviolet light to suppress excessive cell growth.
In daily life, avoid spicy and irritating foods, and consume more foods rich in vitamins A and C, such as carrots and oranges. Wear loose, breathable cotton clothing and avoid synthetic fabrics that may irritate the skin. Proper skincare practices can help restore the health of chest skin.