The rash caused by heat

The rash caused by heat or miliaria is a dermatological diseases caused by blocking sweat ducts, after which sweat can not be eliminated through the skin.

As a result, there are clusters of small red or pink, accompanied by pain, burning and itching.The rash caused by heat 1

The rash usually installed in areas covered by clothing body where skin tissue is not ventilated, the commonly prevalent among young children, the elderly and the overweight and obese.


The role is to protect the skin tissue inside the body from the external environment, acting as a preventive barrier against pathogens that can cause infections, dangerous chemicals or solar radiation. All skin is responsible for regulating the internal temperature of the body through perspiration produced in the sweat glands present in the entire body (except for small areas such as nails or ear canals).

The sweat glands are in the dermis, the deep layer of the skin, the brain centers responsible tuned with temperature. Sweat reaches the surface, the glands that produce sweat through ducts. When they eventually get to be obstructed, sweat remains below the top layer of skin, causing mild inflammation or rash.

It is not always easy to determine which produces blocking sweat ducts, but among the possible causes include

  • Immature sweat ducts. Since these anatomical structures are not sufficiently developed in the first year of life, babies can suffer sweat ducts easier bottlenecks, especially in hot summer days (or when the baby is held in a room overheated). Newborns are kept in incubator or fever often are most likely heat rash.
  • Tropical climate. Weather very hot and humid in general favors the appearance miliariei.
  • Intensive exercise. Fitness training, exercise support or any other activities that stimulate sweating can lead to heat rash.
  • Certain textiles. Clothes made ​​of materials that do not allow normal evaporation of perspiration are possible causes miliariei.
  • Some medicines. Drug substances that stimulate the sweat glands contribute to the development of heat rash; these include clonidine, beta-blockers and sleeping pills.
  • Overheating of the body. Too hot in the room, too thick pajamas or use an electric beds increase the risk of miliariei.
  • Creams and ointments fat. These products can cause blocking sweat ducts.
  • Bed rest. Patients who are hospitalized for long periods and cross episodes of high fever are more prone to milia.

The rash caused by heat


Among adults, Heat rash occurs inside the folds of skin and clothing production in regions where constant friction in the skin tissue. For young children, mylar appears on the neck, shoulders, chest, armpit, genital area or elbow creases.


Since there are several types of heat rash symptoms also vary from one case to another.

  • Miliaria crystal (sudamina). It is the mildest form of heat rash caused by sweat ducts and affects the top layer of skin. Its symptoms are small blisters, transparent, filled with clear fluid or papules that break easily. It has no pain or itch and goes away by itself, but may recur when a hot and humid climate.
  • Miliaria rubra. Occurs deeper in the skin, the adults living in tropical climates and babies 1-3 weeks. Its symptoms are red bumps, itching or tingling in the affected area, very small amounts of sweat or no sweat in the sick (anhidrosis). Rubra miliariei vesicles can, occasionally, blistering, developing milia pustulosa.
  • Miliaria deep. A rare form of heat rash occurs among adults who have suffered repeatedly from miliaria rubra. The disease affects the dermis and especially after exercise triggers that stimulate sweating. Its symptoms are firm red or pink lesions and anhidrosis, accompanied by exhaustion, dizziness, nausea and rapid heart rate.

Heat rash does not require treatment in its mild forms, because symptoms disappear on their own within a few days. If clinical manifestations persist, the eruption seems to grow and there are signs of infection (increased pain, swelling, redness and warmth in the affected area, discharge of pus, swollen lymph nodes, fever or chills), carry out a medical examination immediately.


A physical examination performed by your dermatologist is sufficient for diagnosis. No further clinical testing.


The best treatment for any type of rash is a cool retreat in the use of loose clothing made ​​of natural materials and avoid deposition of exercise until symptoms. Once it cools skin, milia resolves.


More serious forms of heat rash may require topical treatments given to reduce discomfort and prevent complications. These include

  • Calamine lotion to relieve itching;
  • Anhydrous lanolin to prevent blocking sweat ducts and the formation of new lesions;
  • Topical steroids in severe cases.


Some natural treatments effective in calming miliariei include

  • Cold water salty. Wash the affected area thoroughly with cold water as in sea salt is introduced.
  • Baking soda. Eruptions is buffered with a solution prepared from sodium bicarbonate and water.
  • Corn starch. Browned a small amount of cornstarch in pan, then to powder her dust affected regions. It can be used similarly and wheat flour.
  • Vinegar and water. If the rash is itchy and stings, vinegar and water solution to help relieve discomfort.
Previous Article
Next Article

Leave a Reply

This site uses Akismet to reduce spam. Learn how your comment data is processed.