It's Not the Same As a Heat Rash
At first glance, it may seem like sun rash and heat rash are the same condition. In reality, the two reactions have different root causes. Sun rash is a response to ultraviolet UVA and UVB rays from the sun. Heat rash, on the other hand, results from heavy perspiration. Obviously, sweating often occurs during sun exposure, but heat rash is still a distinctly different response from sun rash.
Another thing that differentiates the two conditions is how the rashes appear. As we mentioned on the previous page, sun rashes erupt on areas exposed to the sun. Conversely, heat rashes show up in folds of skin that are perspiration rich but often hidden from the sun. For example, the insides of knees and elbows are prime locations for heat rash.
Heat rash is also more frequently observed in newborns and people who live in tropical climates. As you'll learn on the next page, the risk factors for developing sun rash are a bit different. Keep reading to find out more.