What does a heat rash look like? Signs & home treatment
Written by the editorial staff writer at Hola.
Medically reviewed by Dr Nelson Lau, MBBS FRACGP, GP & Digital Health Specialist.

Contents

What is heat rash?
Heat rash is a frequent, non-threatening condition that occurs when the sweat gets trapped in the sweat ducts, causing irritation. It typically occurs during warm and moist weather when the body sweats more than usual and is particularly common in infants, athletes, and individuals living in humid climates. Also read: Heat related illness: Prevention and tipsTypes of heat rash
Heat rash comes in several types, each differing in severity and appearance. The different types are:1. Miliaria Crystallina:
This is the least intense form of heat rash. It manifests as small, clear, fluid-filled blisters or bumps on the skin’s surface. It is usually not painful or itchy and is typically found in areas where sweat gathers, like the neck and chest, and resolves quickly without intervention.2. Miliaria Rubra (Prickly heat):
This is the most common and slightly more severe variant. It appears as red, inflamed bumps that are often itchy and produce a stinging or prickling sensation. It commonly affects areas such as the chest, back, and groin.3. Miliaria Profunda:
This is the most severe variant of heat rash, though it is rarer. It affects deeper sweat ducts and shows up as firm, skin-coloured bumps or nodules. This type can lead to swelling, pain, and in some instances, scarring. It is commonly seen in people who have been exposed to heat for long durations.4. Miliaria Pustulosa:
This form combines elements of miliaria rubra and infection. It presents as pus-filled blisters that may be painful, usually due to bacterial infections within the sweat ducts. Prompt medical attention is necessary to avoid complications. Each type differs in severity, but all are triggered by excessive sweating and sweat getting trapped beneath the skin.Experiencing these symptoms? Speak with a doctor within 15 minutes.
What does a heat rash look like?
A heat rash usually manifests as small red or pink bumps on the skin, often in areas where sweat accumulates, like the neck, chest, back, underarms, or groin. The rash might appear as tiny pimples or blisters and can be accompanied by red, irritated skin. In more severe cases, the rash may develop into clear, fluid-filled blisters. The appearance and intensity of the rash can vary depending on the type of heat rash and the extent of exposure to heat and perspiration.What are the symptoms of heat rash?
The symptoms of heat rash include:- Tiny red or pink bumps
- Prickling or itchy sensation
- Blisters
- Swelling
- Irritation
- Red skin
What causes heat rash?
Heat rash is common in hot, humid weather or when the body produces excessive sweat. Here are the main causes:- Blockage of sweat ducts: Excessive perspiration can lead to the obstruction of sweat ducts, resulting in an inability for sweat to reach the skin's surface. This obstruction may provoke irritation.
- Overheating: The utilisation of tight or non-breathable garments retains heat and moisture, hindering the evaporation of sweat. Additionally, engaging in strenuous physical activities in elevated temperatures can further exacerbate this issue.
- Skin friction: The friction generated from skin-to-skin contact or clothing may irritate the sweat ducts, contributing to the severity of the rash.
- Immature sweat ducts in infants: Newborns and infants exhibit a heightened vulnerability to heat rash due to the incomplete development of their sweat ducts, increasing their likelihood of experiencing blockages.
Home treatments for heat rash
- Cold compress: It is advisable to apply a cold, damp washcloth or an ice pack, wrapped in cloth, to the affected area for 10 to 15 minutes. This practice may contribute to a reduction in redness and discomfort.
- Cool shower or bath: Utilise lukewarm or cool water to gently clean the skin. It is important to avoid hot water, as it can aggravate the rash.
- Air dry the skin: After bathing or sweating, allow the skin to air dry instead of using a towel, which might induce further irritation.
- Avoid excessive moisture: It is advisable to wear lightweight, breathable clothing and to change from damp clothes promptly.
- Calamine lotion: This product should be applied to the rash, as it may provide a cooling effect and alleviate itching.
- Aloe vera gel: The natural properties of aloe vera can assist in soothing irritation due to its anti-inflammatory characteristics.
- Cornstarch or talcum powder: Lightly dusting the affected area with cornstarch or talcum powder may help keep it dry and reduce friction. However, it is advisable to avoid using talc on infants due to the risk of inhalation – instead, cornstarch-based powders are safer alternatives.
- Loose breathable fabrics: It is sensible to opt for cotton or moisture-wicking fabrics that promote air circulation.
- Fragrance-free products: To prevent pore blockage, avoid using perfumes, heavy creams, and lotions.
- Stay in air conditioning: If feasible, it is beneficial to remain in a cool and well-ventilated environment.
- Use fans: Utilising fans to circulate air around the affected area can aid in drying sweat.
- Oatmeal baths: Incorporating colloidal oatmeal into a lukewarm bath may provide relief from inflammation and irritation.
- Baking soda solution: Mixing 1 to 2 teaspoons of baking soda into cool water for a gentle rinse may help alleviate itching. Ensure proper dilution to prevent skin irritation.
Can heat rash be prevented?
Heat rash can be effectively prevented by maintaining the skin's temperature, moisture level, and minimising perspiration. The following recommendations may be considered:- Selection of attire: It is advisable to wear loose-fitting and lightweight garments made from materials such as cotton or those designed to wick moisture away from the body.
- Maintaining a cool environment: The use of fans or air conditioning is recommended, along with avoiding exposure to excessive heat and humidity.
- Prevention of overheating: It is important to limit engaging in strenuous activities during hot weather and to ensure adequate hydration.
- Ensuring dry skin: Individuals should promptly change out of damp clothing and may apply talcum or cornstarch powder in areas that are predisposed to moisture accumulation.
- Opting for lightweight skin care products: It is prudent to refrain from using heavy creams or oils that could obstruct the sweat glands.
When to seek a doctor's appointment?
It is advisable to schedule a medical appointment if the heat rash does not show improvement after several days of at-home treatment or if there are indications of infection, such as swelling, pain, or the presence of pus. Furthermore, a consultation with a medical professional is warranted in cases where the rash is severe, characterised by large blisters, significant discomfort, or accompanied by systemic symptoms such as fever or fatigue. Additionally, if there are recurrent occurrences of heat rash despite the implementation of preventive measures, a medical evaluation should be sought to exclude the possibility of underlying conditions or infections.Consult a doctor from home
Accessing medical consultation from the comfort of one's home is facilitated by telehealth services. Telehealth appointments facilitate the communication of symptoms where the practitioner can evaluate the necessity for medical intervention or advising on appropriate measures for symptom management at home.Through a virtual consultation with an online doctor, a healthcare provider can assess the symptoms, confirm the diagnosis, and suggest safe treatment options. In situations deemed necessary, instant scripts or a doctor’s certificate may be transmitted directly to the designated pharmacy. Telehealth facilitates the delivery of prompt and professional medical guidance while allowing individuals to remain in the comfort of their homes, thereby serving as a practical alternative for managing non-emergency health issues. While telehealth appointments are convenient, some cases may require an in-person examination to confirm the diagnosis and rule out other causes of symptoms.
Hola Health offers a comprehensive range of telehealth services designed to enhance healthcare accessibility in Australia. Their services include:
- Instant consult: Patients can consult with Australian registered medical practitioners 24/7 via video calls, often within 15 minutes.
- Medical Certificates: Users can obtain valid medical certificates for work, school, or carer responsibilities online, with approval from accredited practitioners typically within 15 minutes. Whether it is for the same day or multi day medical certificate, an AHPRA-registered health practitioner can help you with a quick doctor’s note.
- Online Prescriptions: Patients can receive online prescriptions and have medications delivered directly to their homes, often within two hours.
- Referrals: Hola Health facilitates referrals to specialists as needed during consultations.
- COVID Antivirals: The service provides access to COVID-19 antiviral medications through online consultations.
- Mental Health Care Plans: Patients can receive tailored mental health care plans that is bulk billing from qualified GPs as part of their telehealth services.
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This content is created for informational purposes only. It is not intended to be a substitute for professional medical advice. Always seek the guidance of your doctor or other qualified health professional with any questions you may have regarding your health or a medical condition. For emergencies please immediately contact 000.
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Get affordable healthcare on your terms, with quick access to qualified, Australian-registered telehealth doctors & health practitioners, 24/7, 365 days a year. No more searching for ‘doctors near me‘ – Hola connects you instantly.
Address: 79 St Georges Terrace, Perth WA 6000
For urgent medical help & in case of emergency,
call 000.
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