What is Heat Rash? Symptoms, Causes and Effective Treatment Methods

Heat rash is a skin condition that occurs with itchy, red and raised lesions. Heat rash occurs due to sweat trapped in the pores and channels under the skin. When sweat accumulated in the body is not expelled from the skin tissue in any way, a rash consisting of small pimples or blisters forms on the skin. Heat rash is common in hot and humid climates. The rash mostly develops in areas of the body that do not receive adequate airflow or where skin-to-skin contact occurs. Symptoms usually appear suddenly and improve over time, but in cases of chronic heat rash, symptoms may persist. The rash may be painful or itchy. Keeping the skin cool and dry can be utilized as a home treatment method under a doctor's supervision. If the rash does not tend to subside within a few days or causes severe pain or discomfort, a doctor's evaluation is required again.

What is Heat Rash?

Heat rash is a harmless but very itchy skin rash. It is also called prickly heat, sweat rash or miliaria. The condition occurs when the body sweats more than usual and the sweat is not expelled from the body. Heat rash occurs more frequently in the summer months and in hot climates.

Who Does Heat Rash Affect?

Heat rash can affect people of all ages. Infants and young children are at higher risk because their sweat glands and ducts are still developing. Sweat is the main cause of heat rash, and people living in hot and humid climates or athletes are also at high risk. Heat rash can affect bedridden patients due to their clothing remaining between their skin and another surface for long periods. Fever symptoms during a different illness can also cause heat rash.

Where on My Body Does Heat Rash Form?

Heat rash can occur anywhere on the body, but it is usually more common in folds where skin touches skin. Common areas where heat rash can be seen include:

Arms and legs

Neck

Back

Armpits

Groin

Under the breasts

Inner thighs

Heat rash can also form in areas where your clothing remains in contact with the skin for a long time, such as the waistband of trousers. It is rarely seen on the face.

What Are the Symptoms of Heat Rash?

Heat rash symptoms can appear in various ways, and these symptoms are usually severe. The rashes caused by heat rash develop minutes to hours after you start sweating. Heat rash is an area of skin clustered with small, pimple-like bumps. Heat rash symptoms may include:

Itching: Heat rash can cause itching. Itching causes a severe and uncomfortable condition in the places where lesions begin to appear, and this situation can cause extreme discomfort to individuals.

Redness: Redness in the affected areas of the skin is a common symptom. Redness can make the skin surface appear raised and sensitive.

Swelling: Heat rash lesions can create a slightly raised appearance on the skin surface. This swelling may occur due to fluid accumulation in the tissue around the lesions.

Blisters: Lesions usually have a raised, blistered appearance above the skin surface. These blisters can be in the form of small sacs with fluid accumulation inside them.

Dryness and Peeling: The skin in heat rash areas can often become dry and peel. This condition can cause increased itching and irritation.

Widespread Distribution: Heat rash can appear in different parts of the body. It is especially common on the elbows, knees, hands and feet, but can also occur on the face and neck.

What Are the Types of Heat Rash?

There are several different types of heat rash. These types are:

Miliaria crystallina: It is the mildest type of heat rash. It affects the upper layer of the skin called the epidermis. It occurs with small bumps on the surface of the skin. The blisters are not painful. They usually do not itch, but the lesions may sometimes crack. If your baby has a rash, you may consider putting mittens on their hands to prevent scratching and open wounds.

Miliaria rubra: This red, raised rash affects the middle epidermis, a deeper layer of the outer skin. Miliaria rubra is commonly called prickly heat because the bumps on the skin can be sensitive. It can also hurt or itch. Miliaria rubra is the most common type of heat rash. The rash can cause discomfort and pain. Sometimes pustules can develop in miliaria rubra. This type of discomfort is called miliaria pustulosa.

Miliaria profunda: Miliaria profunda affects the deepest layer of the skin (dermis). It is very rare among infants and young children. It occurs when fluid-filled pockets form under the skin when sweat leaks out of the sweat glands. The bumps are skin-colored, not clear or red. Lesions resulting from other types of heat rash are usually much larger and harder. Although it shows milder skin symptoms, its effects can be more serious.

What Causes Heat Rash?

Heat rash occurs when the sweat ducts in the skin become blocked and fluid-filled bumps form on the skin. In most cases, the bumps appear in places where one part of the body rubs against another or where friction increases due to tight clothing. Some common factors that cause heat rash may include:

Environmental factors such as weather conditions, humidity, temperature and wind

Excessive sun exposure

Small pieces of dead skin cells (skin secretions) clogging the sweat glands

Too much sweat accumulating between the skin and clothes due to tight clothing

Hair follicles blocking the sweat glands

Stress, anxiety and emotional factors

Hormone changes

How is Heat Rash Diagnosed?

For the diagnosis of heat rash, the doctor first takes the patient's history. Then, they conduct a physical examination to examine the condition of the symptoms. Information such as how long the symptoms have been ongoing, their severity, and the presence of itching can be particularly important. In addition, the size, color, shape and distribution of the lesions are evaluated. Laboratory tests are generally not required to diagnose heat rash, but in some cases, allergy tests or a skin biopsy may be required. Skin tests or blood tests can be performed to evaluate allergic reactions to allergens.

How is Heat Rash Treated?

In mild cases of the condition, it is important to cool the skin under a doctor's supervision and avoid exposure to the heat causing this condition. Once the skin cools, mild heat rash rashes tend to disappear quickly. Some common methods used in heat rash treatment:

Medications to reduce itching: Antihistamines and topical corticosteroids are frequently prescribed by the doctor to reduce itching. Antihistamines control itching and allergic reactions, while corticosteroids reduce redness and inflammation in the skin.

Keeping your skin cool and dry: It is important to move away from hot environments if possible or take protective measures. Taking a cool shower and gently patting the skin dry with a towel can be beneficial.

Wearing cotton clothing: Cotton clothing that allows airflow between the clothing and the skin is important. It is generally necessary to avoid synthetic materials that trap heat.

Eliminating friction: To prevent irritation, it may be necessary to wear loose clothing around the heat rash.

Sun Protection: Sun exposure can increase the severity of heat rashes, so it is important to protect the skin from the sun by using protective clothing.

Treatment of Underlying Causes: Heat rash can often be a symptom of another health problem, so treatment of the underlying causes is important. For example, in heat rashes due to allergic reactions, avoiding allergens or allergy treatment may be required.

Frequently Asked Questions

Heat rash in babies is a skin condition that occurs as a result of clogged sweat glands. Heat rash usually occurs in hot and humid weather conditions or as a result of overdressing. Heat rash is a condition that generally causes itching on the skin. Clogged sweat glands and skin irritation can cause itching in the areas where lesions form. Itching may increase in hot and humid weather conditions. Also, excessive sweating can be effective in exacerbating itching. Heat rash can usually heal on its own under a doctor's supervision by eliminating the factors causing the symptoms and keeping the skin cool and dry. However, if symptoms are severe or persist for a long time, it is important to consult a doctor. Heat rash in adults usually occurs as a result of factors such as excessive sweating, hot and humid weather conditions, overdressing, or skin irritation. Additionally, certain medications, allergies, or sensitivity to skin products can trigger the development of heat rash. Stress can play a role in the occurrence of heat rash in some people. In case of stress, the body's immune system can be affected by this negative situation and cause reactions on the skin as a response, leading to the clogging of sweat glands. Heat rash is usually a skin condition that appears in specific areas of the body, but in some cases, it can spread to the body. Especially under sweating and excessive heat, heat rash can spread and extend to surrounding areas. The spread of heat rash to the body is usually associated with further clogging or irritation of the sweat glands in the skin. When you begin to cool the body, mild heat rash conditions can mostly disappear within a day. Generally, heat rashes last for two to three days. More severe heat rashes can last for several weeks. In the event of a severe heat rash that does not go away with home treatment under a doctor's supervision, a doctor's evaluation is required again. Heat rash is a skin condition that can be seen in all age groups and becomes common especially in hot weather. While symptoms are usually mild, in some cases they can negatively affect the quality of life. If you have rashes, itching or pain on your skin that have not gone away for a long time, you should definitely consult a dermatology specialist.

Hisar Hospital Intercontinental Dermatology Clinic is at your service with its expert physician staff for your skin health. For detailed evaluation and personalized treatment options in heat rash and similar skin problems, make an online appointment now or contact us via our line at 444 5 888.