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How do you diagnose rosacea from pictures of a rash?

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Quick Answer

Dermatologists diagnose rosacea after examining the skin and eyes, followed by asking the patient a series of questions, according to the American Academy of Dermatology. No specific tests determine if someone has rosacea, but dermatologists may confirm a root cause with special tests performed on the skin, notes MedicineNet. A skin biopsy, skin scrape, skin culture or a blood test can help eliminate other causes of facial blushing and redness that occur with rosacea.

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Full Answer

People can find pictures of four subtypes of rosacea through the website of the National Rosacea Society. These photos provide some guidance for how the condition appears on a person's face. Subtype one includes facial redness, while subtype two involves bumps and pimples. Subtype three includes skin thickening around the nose, and subtype four involves eye irritation.

A skin scrape may confirm the presence of Demodex mites on the surface of the skin, states MedicineNet. Demodex mites may cause certain types of rosacea. A skin culture could reveal a staph or herpes infection as opposed to rosacea. Blood tests can confirm lupus, dermatomyositis or some other autoimmune disease that may cause skin inflammation similar to rosacea. Dermatologists remove a piece of skin as part of a skin biopsy, and then doctors examine these cells under a microscope. In addition to rosacea, a skin biopsy can identify rashes, skin cancer and moles.

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