A heat allergy, can also be called heat hives or cholinergic uritcaria. Although it is not considered a type of allergy because it mainly occurs on very hot days, due to a series of allergic reactions that can appear due to heat, sweat, synthetic clothes or use of costume jewelry, for example.
According to the World Health Organization, in the US about 20% of the population suffers from some type of allergy. Among them are the common skin rash in infants and young children, contact dermatitis, urticaria and allergies caused by insect bites.
Signs that indicate heat hives
The symptoms of heat hives can be:
- Small red spots in regions exposed to the sun or in regions where you sweat more;
- Itching in the most affected areas;
- Formation of crusts on the spots due to scratching of the skin;
- Appearance of red plaques on the skin;
- Swelling of the region that was most exposed to the sun.
Other symptoms such as nausea, diarrhea, shortness of breath, vomiting and excessive tiredness, for example, may also occur when the person is exposed to heat for a long time, but may also vary according to the person's degree of allergy.
These changes may occur in people of any age, but are more common in infants, children, the elderly, and people who are bedridden. The regions most affected are the neck and underarms.
How to treat cholinergic urticaria
The treatment for heat hives is to moisturize the skin well with creams containing aloe or calamine, which have a calming action, take cold baths, drink plenty of water, wear light clothing, avoid excessive perspiration and keep the area properly ventilated and fresh.
Cleaning the baby's neck with a soft, clean diaper helps to lessen the rash, reducing irritation. Spraying with talc can also help keep the skin dry. However, if the baby continues to perspire, the talc may not be effective and it is best to give the baby several baths a day+, using only water, to protect the baby's skin.
Slightly cold chamomile tea, or at room temperature is also useful to use on a compress to relieve the skin rash.
In more severe situations, if these measures are not sufficient to resolve the problem, it may be necessary to use corticosteroid lotions, creams or ointments, such as hydrocortisone or betamethasone, but only if prescribed by your doctor. Products containing steroids should be used in small amounts and applied in a thin layer for a short period of time, indicated by the doctor, so as not to damage the skin.