If you’re not careful, exposure to high heat and humidity can lead to serious issues. Heat exhaustion and heat stroke are possibilities when temperatures climb, but one of the more common (and overlooked) side effects is heat rash. Knowing how to prevent and treat it can keep you and your family comfortable and healthy when the heat hits hardest.
What Is a Heat Rash?
Heat rash, or prickly heat or miliaria rubra, is an uncomfortable skin condition that occurs when sweat becomes trapped in the skin’s pores. This blockage leads to inflammation and the formation of tiny, red bumps.
Although typically mild and temporary, heat rash can cause significant discomfort and itchiness. In rare cases, it can escalate to the point where medical intervention is necessary.
Adults typically develop heat rash in skin folds and areas where clothing rubs against the skin. Babies are more prone to developing it in their necks, shoulders, chest, the creases of their elbows, and behind their knees.
Types and Symptoms of Heat Rash
While many people imagine mild, itchy red bumps when they think of heat rashes, it isn’t the only form. There are several types to be aware of, including:
- Miliaria Crystallina: This is the mildest form of heat rash, occurring when sweat pores are blocked. It features tiny, clear, fluid-filled bumps that break easily.
- Miliaria Rubra: Also known as prickly heat, small, inflamed, blister-like bumps, and an itching or prickling sensation in the affected area characterize this form and cause more discomfort.
- Miliaria Pustulosa: When the bumps caused by miliaria rubra fill with pus, they become a slightly more severe version known as miliaria pustulosa.
- Miliaria Profunda: This rare form affects the dermis, the deepest layer of skin. It causes firm, painful, or itchy, inflamed bumps that resemble goosebumps and may break open.
In general, heat rashes often manifest as small bumps that can sometimes be filled with pus. These bumps may feel itchy or prickly, but professional treatment may be necessary if they begin oozing pus or become excessively painful.
Heat Rash Treatment
The best way to treat heat rash is to cool the skin and soothe the itchy or prickly sensations it causes. People are advised to take cool showers or baths, wear breathable and loose-fitting clothing, use lightweight bedding, and drink plenty of fluids to stay hydrated.
Eliminating that uncomfortable itchiness or prickliness usually involves applying a cold compress or ice pack wrapped in a towel for up to twenty minutes. It’s essential to avoid scratching the rash, as this can cause the bumps or blisters to pop or break open, increasing the possibility of infection.
A few other tricks, such as applying calamine lotion or soaking in an oatmeal bath, may also help reduce the unpleasant side effects of heat rashes.
Here’s a quick summary of tips for treatment:
- Cool the area down
- Keep skin clean and dry
- Apply calamine lotion
- Consider an oatmeal bath
- Avoid heavy creams or ointments
- Try not to scratch
However, avoid these methods if your symptoms appear severe or if the bumps have burst open.
Heat Rash in Minnesota
Minnesota’s humid continental climate means heat rash isn’t simply a problem you face at the beach. Heat rash can be a significant issue during hot and humid stretches in late spring, summer, and even in early fall.
That said, heat rash is not strictly a seasonal problem for children and adults. In fact, activities like playing hockey or working in hot indoor environments can even lead to heat rash during the winter months. So, there’s a year-round chance that Minnesotans could fall victim to heat rash.
If you’re regularly exposed to high heat or humidity, or if you’re a parent hoping to protect your child, check out the following section on heat rash prevention.
Tips: How to Prevent Heat Rash
Since heat rash occurs when sweat gets trapped in the skin’s pores, prevention comes down to reducing that buildup and making it easier for sweat to evaporate. That’s true whether you’re dealing with a humid Minnesota July or an unusually warm spring day in the Twin Cities.
This can involve:
- Staying indoors or in shaded areas when it’s hot and humid outside
- Drinking plenty of water to stay hydrated
- Avoiding excessive physical activity during peak heat hours
- Wearing loose-fitting, breathable cotton clothing
- Keeping your skin cool and clean with regular showers
However, heat rashes may occur occasionally, especially in infants and young children, even when all these prevention techniques are utilized. When that happens, you’ll want to know the best treatment methods.
Skin Conditions That Look Like Heat Rash
There are common skin reactions that may appear to be heat rash at first, but turn out to be something else entirely. Such reactions commonly mistaken for heat rash include:
- Eczema flare-ups: Heat and sweat are known to trigger eczema flare-ups.
- Folliculitis: This is a common skin condition where hair follicles become inflamed or infected, resembling heat rash. Typically associated with athletes or people wearing tight clothing/gear.
- Contact dermatitis: A reaction brought on by poison ivy or other outdoor plants in Minnesota, typically during warm months.
How Can You Tell the Difference Between Heat Rash and an Allergic Reaction?
Two factors you’ll want to consider are texture and timing. Allergic reactions manifest as raised welts or hives, indicating an immune system response. At the same time, a heat rash alters the skin’s texture, leading to a rough, bumpy patch.
The other key factor to consider is the timing.
Have you recently come in contact with an allergen or been sweating excessively? Consider whether symptoms appear suddenly, indicating an allergic reaction, or become apparent over time, which is more typical of a heat rash.
When to See a Doctor for Heat Rash
Most heat rash clears up on its own within a few days to a few weeks. But some cases call for a closer look. Reach out to a provider if you notice:
- Pus-filled blisters
- Fever
- Swollen lymph nodes
- Unmanageable itchiness/discomfort
Most people who develop heat rash experience only mild symptoms, often clearing up within a few days to a few weeks.
However, occasionally, the rash doesn’t go away on its own, or people develop concerning symptoms that require treatment from a medical professional. A healthcare provider can assess your condition quickly online and prescribe medication to manage your symptoms. The Urgency Room offers online visits for fast, friendly care..