Dandruff, in itself is fairly harmless, unless it becomes really chronic. Also, dandruff can be tackled quite easily. However, dandruff, dermatitis, eczema, scalp infection and psoriasis – all have similar symptoms and manifestations; but they have very different causes. Therefore, the treatment regimen will be different.
More often than not, you do not need to meet with a doctor to treat your dandruff; but, you need to be sure that the condition you are trying to tackle is actually dandruff and not another medical condition. You should visit a trichologist to understand what it is that you are suffering from.