A circular rash appears as round, red circles or ring-shaped spots on the skin. One of the most common causes of circular rash is ringworm, a fungal infection. A red circle on the skin that is not ringworm may be caused by various factors, including allergies, lupus, Lyme disease, eczema, and other conditions.
A circular rash is often associated with an itching sensation like ringworm, eczema, or allergies. However, in some cases, it may not be itchy like granuloma annulare, some types of lupus rash, etc.
Table of Contents
Below you will find 10 skin conditions that can present with a circular skin rash.
1. Ringworm
- Key features
- Appearance: Red, pink, or brown circles on the skin.
- Location: Any part of the body.
- Is it itchy? Usually yes.
Ringworm is a contagious fungal infection that can involve the skin, nails, and scalp. Depending on the part affected, it can have different names or symptoms. Ringworm of the body (excluding hands, foot, groin, face, scalp, beard, and nails) is called tinea corporis, ringworm of the groin is called tinea cruris, ringworm of hands is called tinea manuum, and so on.
Ringworm presents with an itchy red circular rash. The center may show clearing and the edge of the circle may be raised, giving the appearance of red rings on the skin.
Depending on the skin tone, the patch can appear pink, red, or brown. There may be areas of flakiness.
Read more: What does a ringworm rash look like?
Cause
It occurs due to infection by fungi called dermatophytes. One can get it from others with infective lesions or contaminated surfaces. One can also get it from infected animals.
A few factors may increase one’s chance of getting ringworm:
- Humid environment
- Weaker immune system
- Diabetes
- Excessive sweating
- Using public showers or gym rooms
Treatment
The affected area should be kept clean and dry. Over-the-counter antifungals like clotrimazole (Lotrimin AF) or terbinafine (Lamisil AT) may help in clearing the lesions.
In some resistant cases, your doctor may prescribe topical or oral antifungals.
2. Hives
- Key features
- Appearance: Red or skin-colored spots.
- Location: Any part of the body.
- Is it itchy? Usually yes.
Hives, also known as urticaria, can present as circular bumps on the skin, which may be red, skin-colored, or light brown.
Hives are blanchable, which means they temporarily turn pale or white when pressure is applied.
Depending on how long they last, they can be acute (lasting less than six weeks) or chronic (longer than six weeks).
Cause
Hives often occur due to the release of a chemical called histamine from our immune cells.
These can appear in response to certain medications, animal dander, dust, mold, infections, and certain foods like nuts, seafood, eggs, etc.
In some cases, hives may be associated with angioedema, which can be serious if it affects the airways. Additionally, hives can occasionally be associated with anaphylaxis, which can lead to chest tightness, difficulty in breathing, dizziness, and confusion. One should go to the hospital immediately if experiencing any of these symptoms.
Treatment
Treatment includes avoiding the trigger, over-the-counter antihistamines, and in a few cases, prescription medications.
3. Psoriasis
- Key features
- Appearance: Raised round red patches or bumps.
- Location: Commonly involves elbows, knees, scalp, chest, and back.
- Is it itchy? Yes, it can be itchy.
Psoriasis is a chronic inflammatory skin condition characterized by increased cell turnover. The symptoms can vary depending on the type of psoriasis.
The most common type, plaque psoriasis, can present with red, oval, or round patches on the skin. These patches may be covered with silvery-white scales.
It may be associated with itching. The most commonly affected areas are elbows, knees, scalp, and trunk.
Cause
The exact cause is not clear. Genetic factors, immune system, and environmental factors may play a role. Any injury, infection, or stress can trigger an outbreak.
Treatment
It is usually treated with topicals and shampoos containing coal tar or salicylic acid. In some cases, topical steroids, immunosuppressants, and vitamin D or A (retinoids) derivatives are prescribed. Phototherapy may also be recommended.
4. Pityriasis rosea
- Key features
- Appearance: Red oval or round spots.
- Location: Usually involves the trunk.
- Is it itchy? It may be itchy.
Pityriasis rosea can present with a red circle rash. Flu-like symptoms such as fever and malaise may precede the rash.
The initial red patch that appears is known as the “Herald patch”. This oval or circular patch can reach up to 10 cm in diameter and typically appears on the chest, back, or abdomen.
In up to 2 weeks after the first patch, smaller red areas can appear in the form of a Christmas tree. These spots can be more widespread and usually involve the trunk, arms, and thighs.
The spots can be associated with itching.
Cause
The exact cause is not known. Some theories suggest its association with certain viruses (like herpesvirus type 6) or medications.
Treatment
The rash is self-limiting and usually clears in 6-10 weeks. If the itching is severe, your doctor may prescribe antihistamines or steroids.
5. Lyme disease
- Key features
- Appearance: Ring-shaped lesions with a bull’s eye appearance.
- Is it itchy? It is usually not itchy.
- Location: Any part of the body.
Lyme disease is an infection caused by Borrelia, a type of bacteria. It occurs when an infected tick bites a human. It is common in some parts of the USA and Europe.
The symptoms usually appear 3 to 30 days after a tick bite. Some people (in around 50% of cases) develop flu-like symptoms like headache, fever, chills, joint pain, or enlarged lymph nodes.
Around 70% of patients develop a skin rash that presents as red circular spots (erythema migrans).
Usually, the center of the bite has a red spot where the tick bit the skin. This is surrounded by a clear zone, followed by an outer ring that is also red. It has a bull’s-eye appearance, reminiscent of a red circle with a dot in the middle.
In some cases, the area may appear uniform in color, presenting as a red circular patch.
If left untreated, it can involve several other parts of the body, like the heart, central nervous system, eyes, etc.
The late symptoms may include:
- Chest pain
- Abnormal heart rate
- Arthritis
- Nerve pain or numbness
- Headache
- Dizziness
- Facial paralysis
- Vision loss
Treatment
It is treated with antibiotics, and the outcome is best if treated in the early stages.
6. Nummular eczema
- Key features
- Appearance: Red coin-shaped lesions.
- Location: Usually involves limbs and trunk.
- Is it itchy? It may be itchy.
Dry circular or round patches on the skin can be due to discoid eczema or nummular dermatitis.
Discoid eczema typically begins as small red bumps that merge together to form red or pink coin-shaped spots. On darker skin tones, these spots may appear brown. They typically range in size from 1 to 10 cm and may exude clear fluid, exhibiting a scaly or crusty surface.
These spots are often accompanied by itching.
Discoid eczema predominantly affects the legs, arms, or trunk, while the face and scalp are usually unaffected.
Cause
The exact cause is not known. It may be associated with the following factors:
- Injury
- Dryness
- Allergies
- Irritating soaps
- Poor circulation in legs
- Dry environment
- Rough fabrics
- Certain medications
Treatment
The treatment includes restoring the skin barrier and avoiding further skin irritation. Gentle skincare with thick emollient moisturizers can be beneficial.
Your doctor may prescribe the following medications:
- Topical steroids
- Antihistamines
- Systemic steroids
- Light therapy
7. Contact dermatitis
- Key features
- Appearance: Flat red spots or bumps.
- Location: Any part of the body.
- Is it itchy? Usually yes.
A red itchy circular rash can appear on the skin when it comes in contact with any round object that contains skin irritants or allergens.
Cause
Contact dermatitis can be of two types:
Allergic contact dermatitis occurs when the skin comes in contact with an allergen like a round pendant or other jewelry with nickel, poison ivy, etc.
Irritant contact dermatitis can occur when the skin comes in contact with an irritant which can damage the skin barrier. The common irritants are fragrances, essential oils, surfactants, etc.
Treatment
- Avoid further contact with the allergen or irritant.
- Use gentle skincare products.
- Avoid metal jewelry with nickel.
- Apply a cool compress.
- Antihistamines and topical steroids may help in decreasing the symptoms.
8. Granuloma annulare
- Key features (localized type)
- Appearance: Red spots in the form of rings.
- Location: Commonly involves feet, hands, or fingers.
- Is it itchy? Usually, no.
Granuloma annulare is an inflammatory skin condition that is of various types, with the localized form being the most common. This type of granuloma annulare can present with red rings on the skin.
The surface of these spots is smooth, and the center may be slightly depressed. This type of granuloma annulare is usually seen in children and young adults. It usually does not itch or hurt.
There are a few other types that are less common, like the generalized type, which is seen in adults and can be itchy.
Cause
The exact cause is not known. The precipitating factors include injury, insect bites, infection, medications, or sun exposure.
It is commonly seen in females and people with diabetes, thyroid disease, or HIV.
Treatment
These spots usually resolve over time: however, treatment can help in clearing them faster.
The common treatments include:
- Topical steroids or calcineurin inhibitors
- Oral medications like steroids or antimalarials
- Steroid injection
- Freezing
- Laser
9. Lupus
- Key features
- Appearance: Red spots which may appear in the form of rings.
- Location: Usually in sun-exposed areas.
- Is it itchy? Chronic and subacute types are usually not itchy.
Cutaneous lupus is a group of disorders that affect the skin. Some cases of skin lupus may be associated with systemic lupus erythematosus (SLE). Sun exposure can make it worse.
The 3 main types include:
Acute cutaneous lupus: It presents with a red rash in a butterfly pattern involving the cheeks and nose.
Subacute cutaneous lupus: It presents with red raised circular scaly spots which may resemble psoriatic patches. It is commonly seen on sun-exposed areas like the upper arms or trunk.
Chronic cutaneous lupus: The most common type of chronic cutaneous form is discoid lupus. Discoid lupus presents with red and scaly patches or bumps in a circular pattern, which can lead to scarring and hair loss. It commonly affects the scalp, ears, cheeks, nose, and lips.
Cause
Genetics, environmental factors, and the immune system may play a role. It is more common in females and usually occurs between ages 20-50 years.
Treatment
- Protect your skin from the sun and use broad-spectrum sunscreen.
- Avoid smoking.
- Your doctor may prescribe topical steroids, oral steroids, antimalarials, or immunomodulators.
10. Syphilis
- Key features (secondary syphilis)
- Appearance: Red, round, or oval spots or bumps.
- Location: Trunk, palms, and soles.
- Is it itchy? Usually, no.
Syphilis is a sexually transmitted disease that can present at different stages depending on the progress of the disease.
In primary syphilis, a painless firm round sore which is called a chancre, appears on the genitalia. It usually heals in a few weeks.
This is followed by the next stage, known as secondary syphilis, which typically occurs 3 to 8 weeks later. During this stage, red or reddish-brown oval or round spots may appear on the body. These spots can feel scaly and rough to the touch.
It usually involves the trunk, palms, and soles. It may be accompanied by systemic symptoms like fever, malaise, or enlarged lymph nodes.
If left untreated, it can progress to tertiary syphilis and can affect vital organs of the body.
Cause
Syphilis is caused by a spirochete bacteria called Treponema pallidum. It can be transferred by direct contact with the lesions. A pregnant female can transfer the infection to the baby.
Treatment
It is treated with antibiotics, usually penicillin. It is important to treat it in the early stages to prevent long-term complications.
When to see a doctor
One should see a doctor if:
- If the rash involves a large area of the body.
- It is painful.
- There is a visible discharge.
- It is accompanied by other symptoms like fever, confusion, dizziness, headache, joint pain, etc.
- Rash occurred after a tick bite.
- The rash doesn’t go away.
- You are not sure what is causing the rash.
Key points
A circular rash often makes us think about ringworm which is a fungal infection. However, several other conditions can lead to red circular rashes like eczema, contact dermatitis, Lyme disease, syphilis, inflammatory skin conditions (like psoriasis and pityriasis rosea), lupus, or granuloma annulare.
Some of these rashes go away on their own; however, some need treatment to prevent long-term complications.
If you are not sure what is causing the circular rash, it’s best to see a doctor who can help identify the cause and recommend appropriate treatment.
References
- Lyme disease. Ngan V. 2003. DermNet.
- Robinson CA, Love LW, Farci F. Nummular Dermatitis. [Updated 2022 Oct 3]. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2022 Jan.
- Samotij D, Szczęch J, Kushner CJ, Mowla MR, Dańczak-Pazdrowska A, Antiga E, Chasset F, Furukawa F, Hasegawa M, Hashizume H, Islam A, Ikeda T, Lesiak A, Polańska A, Misery L, Szepietowski JC, Tsuruta D, Adamski Z, Werth VP, Reich A. Prevalence of Pruritus in Cutaneous Lupus Erythematosus: Brief Report of a Multicenter, Multinational Cross-Sectional Study. Biomed Res Int. 2018 Jul 25;2018:3491798. doi: 10.1155/2018/3491798. PMID: 30148164; PMCID: PMC6083500.
- Syphilis. CDC.
- Schmieder SJ, Harper CD, Schmieder GJ. Granuloma Annulare. [Updated 2022 Apr 18]. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2022 Jan.
- Litchman G, Nair PA, Le JK. Pityriasis Rosea. [Updated 2022 Jul 18]. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2022 Jan.
Disclaimer: This blog post is for information purposes only and does not replace medical advice.