Brown blotches on the trunk after sun exposure.

Hello Dr. Irwin- I have a strange skin issue. I've noticed that when I go out suntanning without a shirt, I develop a few light-brown colored blotches on my torso (I'm a white male). It's immediate, like the next day. They are small, dime-sized or less. They aren't raised and they don't itch. They look like little patches of dry skin. The first time it happened I stayed out of the sun for a few months and the discoloration faded away. But then recently I went out in the sun again and got more spots. I'm only 33, so they aren't due to age (and again, it seems to happen immediately). Is there anything I can do to either prevent them, or to more quickly fade the most recent blotches that showed up? Also, if the sun exposure is just a coincidence and you think it's from something I'm eating or something, let me know. Thank you!

You’ll need your doctor to help you with this one, so please make an appointment.   This is often due to one of two things ………….sun damage and no………….sadly 33 isn’t too early to have this.  The immediate darkening is due to a UVA effect and if it’s sun damage it can take some months to fade.

The other common cause is Tinea Versicolor which is good yeasty type organism that we all have on our skin.   In some people though, it likes to “overgrow.”  especially in hot, humid weather.    It forms sometimes pinkish and sometimes tannish spots on the skin.   A doctor can prescribe something for you.  Also for prevention Selsun Blue, scrubbed into the area with a washclot and left on for 3-5 minutes once a week, may help prevent it.  The yeast doesn’t like the selenium.  See your doctor to be sure.

Dr. I

Dr. Brandith Irwin, MD

Ask me your skincare question!

Hi, I’m Dr. Irwin. I believe that consumers deserve a medically trained and unbiased skin care advocate.

  • All our content is written and researched by myself.
  • My medical office in Seattle has treated thousands of patients for 15+ years.
  • This site is not affiliated or financially tied to any product, treatment or device.
Ask Me Something
SkinTour Skincare
One of the best investments in your skin is your daily skincare. Why? Because you can prevent many problems with blotchy skin color, lack of glow, texture, some types of acne, and fine lines with good skincare products. You can also correct some of these problems with effective skincare products. Great skincare is often more expensive because quality ingredients are expensive. Some companies spend on research/development which benefits all of us and adds to the cost. Are they worth it? In general - yes! I have handpicked some of what I consider to be the best skin care products, and offer them for sale on SkinTour's shop. This is based on my team and I's testing and research at our clinic. Many of the products are in my own regimen. What could be better than using skin care products a dermatologist uses?!