Difference Between Heat Rash and Allergic Reaction

Key Difference – Heat Rash vs Allergic Reaction

Thekey differencebetween heat rash and allergic reaction is based on their cause. Let us first see, how these two medical conditions occur. Skin is the protective barrier between the body and the outside environment.Sweat glands,which help in cooling the body by perspiration of the sweat, are located in the skin.When the sweat glands are blocked, sweat cannot get to the surface and is trapped in the sweat gland.It causes some inflammations that result in a rash.This is called asweat rash. In contrast,当人体对无害环境药物产生免疫介导的反应时，就会发生过敏反应。Allergy can manifest commonly as urticaria. Urticaria looks like multiple, intensely itchy irregular, large, slightly elevated pale red patches. Allergy can also lead to bronchospasms, anaphylactic shock, and death.

什么是热皮疹？

热rashes are common during warm weather where the sweat production is more and sweat ducts can get easily obstructed. It appears all over the body; especially at skin creases. Sweat rash will appear as small reddish, itchy, tiny papules. Thesymptoms of heat rashare the same in infants and adults. Tight clothing can increase the risk of getting sweat rashes. They do not spread from one person to the other. Sweat rashes are common among infants, elderly and obese people. Good skin hygiene can prevent sweat rashes and resolve of them. The following steps can help to relieve symptoms.

• Removing or loosening clothing.
• Let the skin air-dry instead of using towels.
• Avoid ointments or other lotions which can irritate the skin

What is Allergic Reaction?

An allergic reaction is an免疫-mediated reaction to a harmless external agent. Urticaria or麻疹are the最常见的表现on allergic rashes. It looks like pale red, raised, itchy bumps. Urticaria appears very quickly upon exposure to the antigenic material and can appear all over the body except palm, soles, and the scalp. These reactions are mediated by mast cells, and Ig M immunoglobulins and is known as Type 1 immune reaction. Treatments are by preventing further contact with the known allergen and administration of steroids and antihistamines. It will take few days for the complete resolution of the rash despite the treatment. Some people have a tendency to develop an allergy to many environmental agents. It is important to get medical advice for urticaria as they can end up with more severe form of allergies such as bronchospasms and anaphylactic shock.

What is the difference between Heat Rash and Allergic Reaction?

Definition of痱子and Allergic Reaction

痱子:由于汗腺中的管道阻塞引起的炎症皮肤病，其特征是小红丘疹的喷发，伴有瘙痒或刺痛的感觉。

Allergic Reactions:免疫系统对与皮肤，鼻子，眼睛，呼吸道和胃肠道接触的称为过敏原的物质的过敏反应。

Cause of痱子and Allergic Reaction

痱子:热rash is caused by obstructions in the sweat ducts during warm weather.

Allergic Reactions:Allergic reactions are caused by the immune system of the body against harmless environmental agents such as drugs or seafood.

Characteristics of痱子and Allergic Reaction

Appearance:

痱子:热rash appears as itchy tiny red dots.

Allergic Reactions:Allergic urticaria appears as itchy, pale red patches.

Course:

痱子:热rash appears slowly over hours to days.

Allergic Reactions:荨麻疹可以在几分钟之内出现。

并发症：

痱子:热rashes can rarely get infected.

Allergic Reactions:荨麻疹可以发展为过敏性休克。

Treatment:

痱子:热皮疹需要良好的皮肤卫生。

Allergic Reactions:荨麻疹需要短暂的类固醇和抗组胺药。

Image Courtesy:

“Miliaria rubra mild” by Sentient Planet – Own work.(C BY-SA 3.0)viaCommons

“Tissues Affected In Allergic Inflammation” by SariSabban –Sabban，Sari(2011), The University of Sheffield.(CC BY-SA 3.0)viaCommons