Common and rare causes of rash

Common and rare causes of rash

diverse causes rash Between allergies, insect bites, bacterial, viral or fungal infections and other possible reasons that are almost impossible to list.

But in general, most causes of a benign rash can be treated or treated with a few home care steps or with topical or oral medications, with the advice of a healthcare provider. However, there are some rare causes They represent more serious medical conditions, and require immediate and emergency medical intervention.

In this article, learn about the group of most common causes of rashes, in addition to the rare and potentially life-threatening causes.

causes rash

include Common causes of rash the following:

Contact dermatitis

Contact dermatitis is one of the most common causes of skin rashes, and it is classified into three types, namely: [1]

  • Allergic contact dermatitisIt occurs as a result of an allergic-immune reaction that appears on the skin when or after touching a person’s allergen. Examples of common allergens include: [2]
  • Jewelry made of gold or nickel.
  • latex; Commonly used in the manufacture of rubber spoons.
  • clothes colors
  • Perfume or chemicals used in the cosmetics and leather industry.
  • Poisonous plants, such as poison ivy.
  • Irritant contact dermatitisThe most common type of contact dermatitis occurs when the skin comes into contact with an irritant or toxic substance, such as: [2]
  • Bleaching materials.
  • battery acid.
  • Pepper spray.
  • Soap.
  • Water, especially for groups whose hands are exposed to a lot of water, such as health workers and hairdressers.
  • PhotodermatitisIt occurs as a result of an interaction between a substance on the skin and light, such as ultraviolet rays from the sun. The resulting rash is usually located in an area that has been exposed to light and has an active chemical on it. This type is relatively rare. [2][3]


It can appear Skin rash As a side effect of certain drugs, or as an allergic reaction, or as a result of increased sensitivity of the skin to light due to taking a drug, which leads to irritation and sensitivity of the skin when exposed to the sun or light. [1]

Examples of medications that may be accompanied by a rash for one of the reasons mentioned above include: [4]

  • antibiotics; May increase skin sensitivity to light.
  • active pharmaceutical ingredients, such as penicillin; Any active medicinal substance may cause an allergic reaction in some and not in others.
  • Infliximab; One of its common side effects is a rash.


get to know eczema also in the name Atopic DermatitisIt is usually a chronic condition. The severity of her symptoms depends on various factors, including age and exposure to triggers. represents one causes rash A frequent appearance, characterized by the following: [1][5]

  • Severely dry skin.
  • Redness of the skin and the appearance of scaly patches in the affected area.
  • Intense itching in the affected area.
  • skin roughness;
  • Cracked skin.

Allergic rhinitis

In some people, allergic rhinitis can cause an itchy hive-like rash. This is an allergic reaction to pollen, and its other symptoms are similar to those of a cold, including a runny nose, watery eyes, and sneezing.

Allergic rhinitis is also known as hay fever or hay fever. [1]

viral infection

Infections and viral diseases are causes rash the most common. Below are 5 viral diseases and their rash symptoms:

  • Chickenpoxcaused by infection with the pigeon zoster virus, and this infection is often accompanied by the following symptoms: [1][7]
  • An annoying or painful rash.
  • Itchy blisters spread all over the body, including the face, chest and back.
  • Heat.
  • Headache;
  • shinglesIt is also caused by the varicella virus which causes chicken pox. The rash that accompanies it is characterized by: [1]
  • A rash similar to chicken pox.
  • The rash appears as a single solid red stripe on the affected area.
  • severe pain
  • measlesIt is a disease caused by the rubella virus, and its symptoms include: [1]
  • A reddish-brown rash.
  • dry cough
  • Heat.
  • Hand, foot and mouth diseasesThis is a common viral infection in children, and it causes a rash with flat, red, non-itchy blisters on the palms of the hands and feet. Other possible symptoms include: [1]
  • anorexia.
  • Lesions or ulcers in the throat, tongue and mouth.
  • Heat.
  • human immunodeficiency virus (AIDS)A rash is a sign of the first stage of HIV infection. The AIDS rash is characterized by: [1]
  • Often, the rash spreads to the upper part of the body.
  • Small red dots that are flat or slightly raised above the surface of the skin.
  • Rash does not itch in most cases.

I had a red spot on the back of my head for a long time, I thought it was a fever, but I was surprised that many red dots appeared under it and I am very worried about the skin cancer and hope for an answer as soon as possible (there is a slight swelling of the lymph nodes in the neck 6 months ago and I did all the necessary tests, God willing there’s nothing.

Bacterial infection

Some bacterial infections cause a rash, such as: [1]

  • second feverStreptococcus pyogenes, a disease caused by the bacterium Streptococcus pyogenes, can cause a rash characterized by the appearance of red spots, which turn into a bright red rash reminiscent of sunburn.
  • Lyme diseaseThis is a bacterial infection that is transmitted to humans through the bite of an infected tick, and in the first stages causes a rash on the skin, and it is not necessary for the rash to appear at the site of the bite.
  • Cellulitis, bacterial infection of the dermis; the deep layer of the skin. This is one of causes a sudden rash or one that develops rapidly.

Fungal infection

Types of fungal infections that are causes rash the following: [1]

  • candidiasis or yeast infection, and the rashes associated with this infection are often characterized by the following:
  • redness of the skin;
  • swelling of the skin;
  • itching;
  • ringwormIt is a fungal infection that often causes a red rash on the skin Looks like a ringIt may have blisters or fluid-filled patches of skin.

autoimmune diseases

Autoimmune diseases involve the immune system attacking healthy body cells and tissues, therefore some cause rashes. An example of this is illness lupusIt is an immune disease that affects several body systems, including the skin, and often causes a rash characterized by: [1]

  • Butterfly bloom awful.
  • Red, scaly spots or a purple scaly rash on the face, neck, or arms

Serious causes of rash

A life-threatening rash is rare, but if it occurs, seek immediate medical attention. Below are the causes of rashes that are serious medical conditions: [6]

  • Pemphigus vulgaris (Vulgaris Pemphigus).
  • Stevens-Johnson syndrome.
  • Toxic epidermal necrosis (TEN).
  • toxic shock syndrome.
  • Staphylococcal scalded skin syndrome.

A rash is one of the main symptoms of the aforementioned disorders, and is characterized by one or more of the following signs: [6]

  • The rash spreads over all or most of the body.
  • The rash affects the skin and mucous membranes of the mouth, nose, eyes, anus or rectum, and vagina or urethra.
  • The rash is accompanied by the appearance of small blisters, with a diameter of about 1 cm, or large ones with a diameter of several centimeters. These blisters are characterized by the following:
  • The blisters or blisters fill with fluid, and they may then rupture, and the skin underneath is wet and sore, then dries out and begins to peel.
  • Fluid-filled blisters or blisters spread over most of the thin, outer layer of the body’s skin.
  • The appearance of blisters in areas of the body’s mucous membranes, such as the mouth. They are more likely to rupture in these areas, and the rupture can cause severe pain.
  • The blisters increase when you press on them or scratch the skin next to them.

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