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If the problem is in the scalp, most pharmacies offer a range of anti-dandruff shampoos available over the counter and can offer advice on how to use them.
However, if symptoms persist after using anti-dandruff shampoo for a month, there seems to be a lot of dandruff, the scalp is very itchy or red or swollen, or the problem is on other areas of the face or body, then it’s time to seek professional advice as this is likely to be Seborrhoea.