Your symptoms may indicate an allergic reaction or a skin condition such as eczema (atopic dermatitis) or urticaria (hives). Please consult a dermatologist for an accurate diagnosis and appropriate treatment. Meanwhile, keep the affected areas clean, avoid irritants, and apply a mild moisturising cream to reduce dryness and irritation.

You should consult your doctor or a dermatologist, as persistent scalp itching and flaking may be due to seborrhoeic dermatitis or psoriasis rather than simple dandruff. Your doctor may recommend an anti-dandruff shampoo containing ingredients such as ketoconazole, zinc pyrithione, selenium sulphide, or coal tar to reduce inflammation and clear flaking skin effectively.

Your skin darkening, persistent itching, and black lines may be caused by a long-term skin condition, such as melasma or post-inflammatory hyperpigmentation, or by a fungal or bacterial infection. Please see a dermatologist for an accurate diagnosis and appropriate treatment.