Which of these is the human body’s largest organ: brain, heart, liver, lungs, or skin? If you guessed skin, bingo! It’s the winner by far—on average it measures 20 square feet and weighs about 10 pounds.1 To visualize the scale, measure a 4-by-5 foot rectangle. Now imagine if any of your other organs were that size!

The condition of our skin can be an excellent indicator of our overall health. How much do you know about your skin? Take this quick quiz, and then we’ll go beyond skin deep and talk about ways to manage common skin ailments.


Rash quiz

1 / 5

You should seek medical attention for a rash if:

2 / 5

Which of these rashes is contagious?

3 / 5

Which of these illnesses can cause a rash?

4 / 5

What percentage of people are allergic to poison ivy?

5 / 5

Rashes can be caused by

Your score is

The average score is 71%


Common treatments

One of the best ways to avoid a rash is to protect yourself from substances that irritate your skin. If you’re allergic to cleaning products, wear rubber or latex gloves. When camping, hiking, or walking in wooded areas, wear clothing that covers your arms, legs, and feet (covering your head, face, and the back of your neck is a good idea too). To keep biting bugs at bay, use a topical or area-wide insect repellent. If you notice that you get a rash after using perfume, cologne, lotion, or scented fabric detergent, try switching to fragrance-free products.

If you develop a rash, wash and dry the area thoroughly. If you picked up something from being outdoors, especially in the case of poison ivy, oak, or sumac, be sure to wash the clothes you were wearing as well as anything that might have come in contact with these irritants. Since itching is one of the most common and annoying side effects of a rash, these over-the-counter products may provide relief:

  • an anti-itch cream made with 1% hydrocortisone
  • an oral antihistamine
  • calamine lotion
  • antifungal ointment
  • colloidal oatmeal bath

Warning signs

Rashes can be serious, especially if they result from an allergic reaction to a medication or are caused by an infection or virus such as shingles, toxic shock syndrome, West Nile, or Zika. The American Academy of Dermatology recommends getting prompt medical attention if a rash:

  • accompanies a fever
  • appears suddenly
  • becomes infected
  • causes pain
  • covers your body
  • spreads quickly
  • starts to develop blisters

How Teladoc can help

Whether you have poison ivy or a rash that comes out of nowhere, Teladoc’s U.S. board-certified doctors can help diagnose it, recommend treatment, and even send a prescription to a nearby pharmacy when medically necessary. Use the Teladoc app to upload images to help the doctor with the diagnosis. We also treat other skin conditions such as acne, dermatitis, eczema, rosacea, and much more!



This portion of the Teladoc website occasionally offers health, fitness, and nutritional information and is provided for educational purposes only. You cannot rely on any information provided here as a substitute for or replacement of professional medical advice, diagnosis, or treatment. Teladoc cannot assure that the information contained on this site always includes the most recent findings or developments with respect to the particular subject matter covered.

If you ever have any concerns or questions about your health, you should always consult with a physician or other healthcare professional. Do not disregard, avoid, or delay obtaining medical or health-related advice from your healthcare professional because of something you may have read on this site. The use of any information provided on this site is solely at your own risk.

If you are in the United States and think you are having a medical or health emergency, call your healthcare professional, or 911, immediately.