Why Do I Break Out in Hives in The Sun?

We’ve all heard about sunburn and how it can be really bad for you. But what about photosensitivity, or an allergy to the sun? People with this allergy, called Fotodermatitis, most commonly break out in hives. Having the hives appear doesn’t just make you look like a bug, but itchy and uncomfortable as well. Hives typically form from 15 to 60 minutes of being in the sun. The more often you’re exposed to sunlight, the worse your case of photosensitivity will become.

The answer to this question can be life-changing, but first, it’s important to note that not everyone with a sun allergy will break out in hives. People may just feel hot and uncomfortable in the sun. I broke out in hives after my trip to the beach one year. The hives that I got were extremely itchy and there was no relief from the burning sensation.

Why Do I Break Out in Hives in The Sun?

One of the most common questions we get asked is “Why do I break out in hives when I’m in the sun?”

The short answer is that the sun’s rays contain UVB, which can cause the body to release histamine and other chemicals that can result in a hive. Histamines are chemicals that are released by cells in response to an allergic reaction or irritation. They cause blood vessels to dilate, allowing more blood to flow through them and increase capillary permeability (so there’s less of a barrier between your skin and whatever it is that’s irritating it). This results in redness, swelling, itching, and hives.

Because of this reaction, people who are extremely sensitive to light should be careful about going outside during peak UVB hours. Some medications for other conditions can also cause hives by increasing histamine levels.

They can be caused by several different things, including allergies and stress. But if you’re one of the many people who get hives while they’re in the sun, you may wonder why.

The most common cause of sun-induced hives is an allergic reaction to sunlight. As your body reacts to UV rays, it releases histamine, which causes those pesky hives to appear on your skin. Histamine also triggers other symptoms like swelling and itching around the affected area(s).

Sunlight isn’t the only thing that can cause these reactions anything from heat to cold temperatures can trigger histamine production and bring on an allergic response. If you notice that these reactions tend to happen only when you’re exposed to sunlight or heat/cold, you likely have seasonal allergies (also known as photodermatitis) rather than an allergy specifically triggered by sunlight exposure alone.

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