What Is Prickly Heat?
Prickly heat, also called heat rash, is a skin condition that happens when sweat becomes trapped beneath the skin. This can occur when sweat ducts become blocked, especially during hot or humid weather.
Common causes and risk factors include:
- Hot or humid weather
- Heavy sweating
- Exercise or physical activity
- Fever
- Tight or heavy clothing
- Bandages or adhesive patches
- Conditions that cause excessive sweating
The trapped sweat can irritate the skin and cause a rash with itching or small bumps. Prickly heat is common in babies and children, but adults can develop it too.
Symptoms
Symptoms usually appear in areas where sweat and friction build up.
Common symptoms include:
- Small red bumps or tiny blisters
- Itching
- A prickling or stinging feeling
- Red or irritated skin
- Rash in skin folds or under clothing
How Is It Diagnosed?
Healthcare providers usually diagnose prickly heat with a physical exam and review of symptoms. The appearance and location of the rash are often enough to confirm the condition.
In rare or severe cases, a skin biopsy may be recommended to rule out other skin conditions.
How Is It Treated?
Most cases of prickly heat improve once the skin is cooled and sweating is reduced.
Treatment may include:
- Staying in a cool environment
- Keeping the skin dry
- Wearing lightweight, breathable clothing
- Avoiding overheating
- Using gentle skin care products
For more uncomfortable symptoms, healthcare providers may recommend:
- Corticosteroid creams to reduce itching
- Drying powders
- Antibiotic creams if infection develops
Most people recover quickly without long-term skin problems.
