Symptoms
Adults usually develop heat rash in folds of skin and wherever clothing
causes friction. In infants, the rash is mainly found on the neck,
shoulders and chest, but it can also occur in the armpits, elbow creases
and groin.
There are three types of miliaria, which are classified according to
where the sweat ducts are blocked. Signs and symptoms for each type
vary.
Miliaria crystallina
The mildest form of heat rash affects the sweat ducts in the topmost layer of skin. Miliaria crystallina is marked by:
Clear, fluid-filled blisters and bumps (papules) that break easily
The blisters that occur with miliaria crystallina aren't itchy or
painful. This type of heat rash usually clears on its own but can come
back if hot, humid weather persists. And though it's common in newborns,
adults can develop it, too.
Miliaria rubra
Occurring deeper in the outer layer of skin (epidermis),
miliaria rubra is sometimes called prickly heat. Adults usually develop
miliaria rubra after they're exposed to hot, humid weather or if they're
confined to bed rest. Infants usually develop this type of heat rash
between the first and third weeks of life. Signs and symptoms typically
include:
Red bumps
Itchy or prickly feeling in the affected area
Little or no sweating in the affected areas (anhidrosis)
Occasionally, miliaria rubra vesicles become pustular and then are called miliaria pustulosa.
Miliaria profunda
A less common form of heat rash, miliaria profunda occurs
mainly in adults who have had repeat bouts of miliaria rubra. It affects
the dermis, a deeper layer of skin, and appears soon after exercise or
any activity that causes sweating. Signs and symptoms may include:
Firm, flesh-colored lesions that resemble goose bumps
A lack of perspiration, which may lead to symptoms of heat exhaustion, such as dizziness, nausea and a rapid pulse
When to see a doctor
Heat rash usually heals on its own and doesn't require medical
care. See your doctor if you or your child has symptoms that last longer
than a few days, the rash seems to be getting worse, or there are signs
of infection, such as:
Increased pain, swelling, redness or warmth around the affected area
Pus draining from the lesions
Swollen lymph nodes in the armpit, neck or groin
A fever or chills
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