Heat rash takes the form of tiny blebs (or blisters) which appear in newborn babies.
Sweat glands are not fully developed in babies, and can become blocked if the baby is too hot. This is why miliaria is commonly seen in newborn babies during summer. It may also appear during a fever, or simply when a baby has been overdressed.
Clinical features
Pinkish blebs or small blisters usually appear over the face, neck and in skin folds, especially in the nappy area. If infected, they may become pus-filled.
Treatment
A tepid bath, light clothing and some fresh air is usually all that is needed for miliaria to disappear. The rash should disappear in 2-3 days. If your baby is scratching the spots, try applying some calamine lotion. Other creams or ointments are useless, and may in fact worsen the rash.
When to see your doctor
• if the spots become red or pus-filled (green). This means that they have become infected, and need treatment;
• if the rash lasts more than 2-3 days;
• if in addition to having a rash, your baby is generally unwell, has a fever or is not feeding well.
Complications
Infection (see above). ,
Prevention
Try not to overdress your baby. Carefully dry all skin folds after each bath.
Don’t dismiss every rash as ‘just a heat rash’. If in doubt, check with your health professional.
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