Skin redness or red patches on the skin can have many different causes, including burns, allergic reactions, infections, and conditions such as seborrheic dermatitis. On darker complexions, these conditions may cause the skin to become darker.

In this article, we discuss several possible reasons for skin redness and when a person should see a doctor.

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Sunburn is a common cause of red skin and typically results from spending too much time in the sun without adequate protection. The ultraviolet rays from the sun damage the skin, which turns red as the body directs more blood to the affected area to repair the damage.

Other symptoms can include:

  • tenderness
  • blisters
  • itching
  • skin peeling

Learn more about sunburn here.

There are many other ways, aside from sunburn, that a person’s skin can become burned. Examples include:

  • Thermal burns. These can occur when the skin comes into contact with something hot, such as flames, steam, and hot liquids
  • Chemical burns. Exposing the skin to strong or irritating chemicals, such as bleaches, acids, and detergents can cause a chemical burn.
  • Electrical burns. These can occur if a strong electrical current, such as from an exposed wire, reaches the skin.
  • Friction burns. When the skin repeatedly rubs against a rough surface or material, it can cause a friction burn.
  • Radiation burns. Radiation exposure can damage the skin, causing burns. For example, burns can be a side effect of radiation therapy for cancer.

Any of these types of burns can cause the skin to turn red.

Doctors class burns according to their severity:

  • First-degree burns are the mildest and usually consist of skin redness.
  • Second-degree and third-degree burns are more serious and damage multiple layers of skin.
  • Fourth-degree burns are the most severe and can affect the bones and muscles below the skin.

Learn more about first-degree burns here.

Dermatitis, or eczema, refers to a group of inflammatory skin conditions. These conditions typically cause red, itchy patches of skin where inflammation has happened.

Some common types of dermatitis are:

  • Contact dermatitis. This form of dermatitis occurs when the skin comes into direct contact with an irritant or allergen that causes an itchy rash.
  • Atopic dermatitis. Also known as atopic eczema, this is a long-term form of dermatitis that often affects children.
  • Seborrheic dermatitis. This is another long-term form of dermatitis that mainly develops on the scalp, but can occur on other parts of the body where there are a lot of oil-producing glands, such as the face and chest. It is also known as dandruff, and in babies, it is called cradle cap.

Dermatitis can cause a range of other symptoms, including:

  • fluid-filled blisters
  • hives, which form an itchy, swollen, red rash
  • dry, scaly, or bumpy skin
  • flaky skin
  • other skin color changes

Learn more about the different types of dermatitis here.

Heat rash is when the skin becomes irritated from hot or humid conditions. The outbreak consists of red, itchy patches of skin with clusters of small, raised pimples. These patches can be uncomfortable and may cause a stinging or prickly sensation.

Heat rashes often develop in areas where the skin folds and so skin-on-skin contact occurs, such as in the groin area or elbow creases.

Learn more about heat rash here.

Folliculitis is a common condition where hair follicles in the skin become inflamed. The inflammation is often the result of a bacterial or fungal infection.

Folliculitis causes small clusters of red bumps to appear around the affected follicles, which may be itchy. The area can become tender, and pus-filled blisters may develop.

Learn more about folliculitis here.

Rosacea is a common condition that causes long-term redness of the skin, typically on the face. The condition usually begins with flushing, which is when the skin temporarily appears red.

These episodes of flushing may last for longer periods of time as rosacea progresses and can become permanent. Other symptoms can include spots, burning, or stinging sensations in the affected areas.

Learn more about rosacea here.

Psoriasis is a long-term condition that causes an overproduction of new skin cells, resulting in red, dry, crusty patches of skin with silvery scales.

These patches tend to develop on the elbows, knees, or scalp but can appear anywhere on the body. The symptoms of psoriasis tend to come and go in cycles.

Learn more about psoriasis here.

Shingles is a viral infection that causes a red rash or blisters on the skin. The rash typically appears on the trunk but can affect any part of the body, including the face and eyes.

Shingles usually begins with a burning or tingling sensation, which can be very painful in some cases. Fluid-filled blisters can also appear, often on just one side of the body.

Only people who have previously had chicken pox can develop shingles.

Learn more about shingles here.

Lupus is a chronic condition where the immune system mistakenly attacks the body’s organs and tissues.

The condition can affect any part of the body, including the skin. Some people with lupus develop rashes on the face, neck, and scalp. These are typically butterfly-shaped areas of reddened, swollen skin.

Learn more about lupus here.

Some people can experience an allergic reaction after taking certain medications, such as:

Drug allergies can cause:

  • skin rashes
  • hives
  • itching
  • skin swelling

In severe cases, a drug allergy can cause anaphylaxis, which is a life-threatening condition.

Symptoms of anaphylaxis may include:

  • breathing difficulties
  • dizziness
  • rapid heartbeat
  • confusion
  • loss of consciousness

Call the emergency services or seek immediate medical attention for any signs of anaphylaxis.

Cellulitis is a skin infection that can become severe if a person does not receive rapid treatment.

Cellulitis occurs when bacteria infect deep layers of the skin and causes the area to become red, swollen, tender, and often warm to touch.

Cellulitis can also cause fever-like symptoms, sometimes before the skin becomes affected. These symptoms can include:

  • fever
  • chills
  • fatigue
  • cold sweats
  • nausea
  • drowsiness
  • difficulty concentrating

If left untreated, cellulitis can lead to severe complications, such as a blood infection.

Learn more about cellulitis here.

Scarlet fever is a contagious bacterial infection that typically affects infants and children. The infection causes a pinky-red rash that can feel rough. The rash usually starts on the chest but can spread to other areas of the body.

Other symptoms of scarlet fever include:

  • red, sore throat
  • high temperature
  • discolored, bumpy tongue
  • swelling of the neck
  • headache
  • muscle aches
  • nausea and vomiting
  • abdominal pain

Learn more about scarlet fever here.

It is not always necessary to see a doctor for skin redness. For example, a person can treat mild cases of sunburn at home by applying moisturizers and drinking plenty of fluids.

However, some causes of red skin do require medical attention. Contact a doctor if the rash:

  • does not go away after several days
  • covers large areas of the body
  • occurs alongside a fever
  • appears suddenly and spreads quickly
  • begins to blister
  • becomes painful
  • show signs of infection, such as feeling warm or producing pus or other fluids

Do I have redness or rosacea?

Rosacea is a long-term condition that mainly affects the face. If skin redness improves over time, it is unlikely to be rosacea. Rosacea may cause tiny broken blood vessels on the skin that do not improve in appearance over time. It can also cause bumps on the face filled with a yellowish liquid.

How do you treat skin redness?

Treatment for skin redness depends on the cause. Redness caused by sunburn or hot flashes often improves over time without special treatment. If allergens cause the redness, avoiding them may improve the skin. Other causes, such as seborrheic dermatitis or psoriasis require treatment by a board-certified dermatologist.

What causes skin redness?

Various factors can cause temporary redness, such as sunburn, hot flashes, food sensitivity, a reaction to medication, or skin irritation. Some conditions can also cause redness, such as rosacea, acne, dermatitis, psoriasis, shingles, and lupus.

There are many possible causes of skin redness, ranging from burns to allergic reactions and infections.

People should see a doctor for red skin that lasts more than a few days or keeps reoccurring. Also, they should seek medical advice for rashes that are extremely painful or occur alongside more severe symptoms.

Some skin conditions are long-term with symptoms returning in cycles. Treatment for these conditions may be lifelong and can involve both medications and lifestyle changes.