Dr Charles, MD | Derm De-Influencer on Instagram: "Dry, itchy scalp? Save this post. Dry scalp but conditioner and oily products make it worse? You’re probably feeding your scalp fungus. Seborrheic dermatitis = Bad Dandruff Seb derm is linked to an overgrowth of malassezia fungus on the scalp. This same fungus is usually found on everyone’s scalp and skin. However, some people have a more robust reaction to this fungus…. That reaction looks like dry, itchy flaky skin characteristic of bad dandru