People with seborrheic dermatitis
produce too much sebum (the natural skin
oil). Later, pityrosporum yeast grows excessively in the sebum, sometime along with bacteria, making the dermatitis more persistent.
You are advised not to use topical steroids for a long time as it may cause skin atrophy, thinning, increased fragility and steroid induced rosacea. Treatment usually involves use of antifungal, anti inflammatory and sebo suppressive or Keratolytic ingredients.