If you suffer from Seborrheic Dermatitis, the dandruff you'll see is typically yellow, oily and crusty. You'll have red itchy patches on your scalp during a breakout. The condition is caused by a fungus and can also show up on the eyebrows, the nose, the cheeks, around the ears, the chest but most typically on the scalp.
The best shampoos for this condition contain anti-fungal active ingredients to help control breakouts or something like salicylic acid to soften the dandruff. Seborrheic Dermatitis is actually a form of eczema and if you do suffer from this condition, you may also be sensitive to some of the other chemicals the manufacturers add to their shampoos. So be aware of what you are putting on your scalp (we'll help out there by alerting you of over 90 harsh contact allergens) and observe the results.