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Red spots on the skin: causes and treatment

by Alivia Nyhan
Published: Last Updated on

The skin is the largest organ in the body and protects us against different environmental agents. However, under certain circumstances, she may present alterations that will manifest themselves in different ways. One of them is the red spots that appear and disappear, and they can do it in a localized manner, in just a segment of skin, or in a generalized way, affecting several parts of your body. Likewise, they can appear suddenly and disappear spontaneously so as not to return, or do so chronically and persist over time, disappearing to do so again in the same or other places.

From a medical point of view, its real name is urticaria, and there are different types depending on their origin and evolution. In the following FastlyHealarticle, we will explain the causes of red spots on the skin that appear and disappear and the appropriate treatment in each case.

Red spots on the skin: allergic causes

The itchy red spots and pimples on the skin can appear as a result of allergic reactions of various kinds, caused by:


Different foods (dairy products and their derivatives, eggs, fish, chocolate, etc.) can trigger an allergic reaction that will manifest in red spots on the skin.


Some medications, especially some antibiotics, have the potential to trigger allergic reactions whose primary manifestation would be the appearance of red spots on the body.

Insect bites

The bites of some insects (lice, mosquitoes, mites, bed bugs, etc.) can cause the so-called papular urticaria, manifesting with red spots on the skin, among other symptoms.


Contact with some plants can also cause allergic-type urticaria (contact dermatitis).


Some people are allergic to latex, and contact with it can lead to an allergic-type urticarial reaction.

Chemical products

Some chemical products (soaps, detergents, creams, etc.) can be harmful to the skin, which would respond by developing red spots.

Other causes of red spots on the skin that come and go

Other causes of red spots on the skin include physical and chemical factors unrelated to allergies. Among these, we can consider:

Viral infections

Coxsackievirus infections and others manifest as urticaria, appearing as red spots on the skin of different extensions and thicknesses that will disappear spontaneously.

Extreme temperatures

Extreme heat or cold can cause temporary red spots in some people at high-exposure sites.

Nerve dermatitis

Stress can cause red spots on the skin by nerves that will be located in the neck and chest and whose manifestation can be exacerbated with alcohol, caffeine, and other beverages.

You can find out in more detail in the article Nerve allergy: symptoms and treatment.


Excessive exercise can cause red spots in sensitive people, primarily red spots on the neck, face, and chest, and more rarely on the extremities.


The use of very tight clothing or the pressure exerted at certain times on specific regions of the body can cause red spots on the skin that appear and disappear spontaneously.

Diagnosis of red spots on the skin

For the precise diagnosis of red spots on the skin, questioning the patient is sometimes sufficient, especially in those cases where the cause is an allergic reaction.

At other times, tests of varying degrees of complexity will be necessary to establish the cause, as in the case of viral infections.

In any case, direct visualization and examination of the spot in question are mandatory. The doctor can adequately assess its characteristics and then establish the following treatment.

Red spots on the skin: treatment

Treatment will, of course, depend on the cause of the red spots on the skin. In all cases, the suppression of the reason is essential, and this is the most effective measure, which can even resolve the situation without any other additional action.

In the case of allergic causes, antihistamines (antiallergics) is necessary. There may be a need to enhance their action by associating oral or injected steroids with the treatment on certain occasions.

In the case of non-allergic causes:

  • The viral infections require supportive measures (antipyretics, antihistamines, etc.) until the infection subsides, which are self-limited and usually last 5 to 7 days at most.
  • The extreme temperatures and pressure will merit the removal of the stimulus.
  • Emotional stress should be treated by therapy of different types so that the person learns to handle situations that cause the eruption.
  • The exercise will require the person to learn to know their limits and identify when the excess of this may initiate the spots to limit them.

This article is merely informative. At FastlyHeal .com, we do not have the power to prescribe medical treatments or make any diagnosis. We invite you to see a doctor if you present any condition or discomfort.

If you want to read more articles similar to Red spots on the skin that appear and disappear: causes and treatment, we recommend entering our Skin, hair, and nails category.

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