Your skin is your body’s largest organ. It covers and protects your body. Your skin
- Holds body fluids in, preventing dehydration
- Keeps harmful microbes out, preventing infections
- Helps you feel things like heat, cold, and pain
- Keeps your body temperature even
- Makes vitamin D when the sun shines on it
Anything that irritates, clogs, or inflames your skin can cause symptoms such as redness, swelling, burning, and itching. Allergies, irritants, your genetic makeup, and certain diseases and immune system problems can cause rashes, hives, and other skin conditions. Many skin problems, such asacne, also affect your appearance.
NIH: National Institute of Arthritis and Musculoskeletal and Skin Diseases
Underneath the Skin
To fully understand psoriasis, you need to see what’s happening underneath the skin.
- When your body has plaque psoriasis, your immune system is overactive, triggering skin inflammation and causing skin cells to be produced faster than normal. New skin cells are pushed to the skin’s surface in 3 to 4 days instead of the usual 28 to 30.
- But your body can’t shed the new skin cells at that fast of a rate. So while new skin cells are being produced, the old, dead skin cells pile up on top of each other.
- As more and more new skin cells are produced rapidly, the old skin cells are pushed to the surface, forming the thick, red, itchy, flaky patches known as plaques.
- The exact cause of psoriasis is unknown.
Learn from a doctor about what causes psoriasis and what is happening inside your body when symptoms occur.
Dr. Menter is chairman of the Division of Dermatology at a prominent U.S. academic medical center. Dr. Menter is also a paid consultant of AbbVie.