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Tests and diagnosis
By Mayo Clinic staffYour doctor can usually diagnose psoriasis after talking to you about your signs and symptoms and examining your skin. Sometimes, however, your doctor may take a small sample of skin (biopsy) that's examined under a microscope to determine the exact type of psoriasis and to rule out other disorders. A skin biopsy is usually done in a doctor's office using a local anesthetic.
Other disorders that can look like psoriasis include:
- Seborrheic dermatitis. This type of dermatitis is characterized by greasy, scaly, itchy, red skin. It's often found on oily areas of the body, such as the face, upper chest and back. Seborrheic dermatitis can also appear on the scalp as stubborn, itchy dandruff.
- Lichen planus. This is an inflammatory skin condition that appears as rows of itchy, flat-topped bumps (lesions) on the arms and legs.
- Ringworm of the body (tinea corporis). Ringworm is caused by a fungal infection on the top layer of your skin. The infection often causes a red, scaly ring or circle of rash.
- Pityriasis rosea. This common skin condition usually begins as one large spot (herald patch) on your chest, abdomen or back, which then spreads. The rash of pityriasis rosea often extends from the middle of the body, and its shape resembles drooping pine-tree branches.
- Gudjonsson JE, et al. Psoriasis. In: Wolff K, et al. Fitzpatrick's Dermatology in General Medicine. 7th ed. New York, N.Y.: The McGraw-Hill Companies; 2008. http://www.accessmedicine.com/popup.aspx?aID=2983781. Accessed Jan. 26, 2009.
- Psoriasis and psoriatic arthritis. American Academy of Dermatology. http://www.aad.org/public/publications/pamphlets/common_psoriasis.html. Accessed Jan. 26, 2009.
- Bodemer AA. Psoriasis. In: Rakel D. Integrative Medicine. 2nd ed. Philadelphia, Pa.: Saunders Elsevier; 2007. http://www.mdconsult.com/das/book/body/117935134-4/796383039/1494/116.html#4-u1.0-B978-1-4160-2954-0..50073-9_3554. Accessed Jan. 26, 2009.
- Questions and answers about psoriasis. National Institute of Arthritis and Musculoskeletal and Skin Diseases. http://www.niams.nih.gov/hi/topics/psoriasis/psoriasis.htm. Accessed Jan. 26, 2009.
- Fluhr JW, et al. Emollients, moisturizers, and keratolytic agents in psoriasis. Clinics in Dermatology. 2008;26:380.
- Feldman SR, et al. Epidemiology, clinical manifestations, and diagnosis of psoriasis. http://www.uptodate.com/home/index.html. Accessed Jan. 26, 2009.
- Feldman SR, et al. Treatment of psoriasis. http://www.uptodate.com/home/index.html. Accessed Jan. 26, 2009.
- Aloe. Natural Medicines Comprehensive Database. http://www.naturaldatabase.com. Accessed Jan. 27, 2009.
- Capsicum. Natural Medicines Comprehensive Database. http://www.naturaldatabase.com. Accessed Jan. 27, 2009.
- Fish oil. Natural Medicines Comprehensive Database. http://www.naturaldatabase.com. Accessed Jan. 28, 2009.
- Traub M, et al. Psoriasis: Pathophysiology, conventional and alternative approaches to treatment. Alternative medicine review. 2007;12:319.
- Gibson LE (expert opinion). Mayo Clinic, Rochester, Minn. Jan. 29, 2009.
- FDA statement on the voluntary withdrawal of Raptiva from the U.S. market. U.S. Food and Drug Administration. http://www.fda.gov/bbs/topics/NEWS/2009/NEW01992.html. Accessed April 9, 2009.
- FDA approves new drug to treat psoriasis. U.S. Food and Drug Administration. http://www.fda.gov/NewsEvents/Newsroom/PressAnnouncements/ucm183851.htm. Accessed Oct. 27, 2009.
