Dermoscribe's seborrheic dermatitis cream has the highest active ingredient concentrations permissable for an over-the-counter cream. It is reported to affect around 4% of the population and can look similar to other skin conditions such as eczema, psoriasis or even allergic reactions. Dermatologists are able to prescribe the cream directly to the customer without a prescription. The exact cause is unknown, but there are theories it could be caused due to issues with seborrheic dermatitis responds best to sulfur, salicylic acid and hydrocortisone. Psoriasis and eczema require different formulas for effective results, says dr. Jennifer mcdonald, founder of dermoscribe's skin care line. Cream is a genuine dermatological formula and should not be used if you are allergic to any of the ingredients including sulfur.