How is seborrheic dermatitis diagnosed?

A doctor or dermatologist can usually diagnose seborrheic dermatitis by examining the affected skin and asking about symptoms. Additional tests may not be necessary.

In some cases, a biopsy may be performed to rule out other skin conditions that can cause similar symptoms. A biopsy involves removing a small piece of skin for examination under a microscope.

Dermatoscopy (also called skin scraping) may also be used to examine the affected area more closely. This procedure involves using a magnifying lens and bright light to look at the skin.

Other diagnostic tests that may be considered include:

- Fungal culture: This test can check for a fungal infection that may be present along with seborrheic dermatitis.

- Blood tests: These tests can help rule out other medical conditions that may be causing the skin symptoms.