A skin rash is a change in skin colour, texture, or appearance and is a common reason people seek medical advice.
Rashes may appear as redness, bumps, scaling, or itching and can range from mild irritation to signs of a serious medical condition.
This article explains five common causes of skin rash, how to recognize warning signs, and when to see a doctor for a skin rash.
Allergic contact dermatitis occurs when the skin reacts to substances such as soaps, cosmetics, metals, plants, or chemicals. The immune system triggers inflammation, leading to redness, itching, and sometimes blisters.
When not to worry
When to see a doctor
Keywords: allergic skin rash, contact dermatitis rash, itchy skin rash
Eczema, also known as atopic dermatitis, is a chronic inflammatory skin condition often associated with allergies or asthma. It causes dry, itchy, and inflamed skin and may flare periodically – often worse in elbow crease and back of knee.
When not to worry
When to see a doctor
Keywords: eczema rash, atopic dermatitis symptoms, chronic itchy rash
Certain viral rashes (such as measles or chickenpox) and bacterial skin infections (such as impetigo or cellulitis) can cause widespread or localised rashes. These are often accompanied by fever or systemic symptoms.
Cellulitis
When not to worry
When to see a doctor
Keywords: viral skin rash, bacterial skin infection rash, rash with fever
This is usually bacterial.
Meningitis glass test
A rash that does not fade under pressure can be a sign of meningococcal septicaemia (meningococcal bacteria can cause meningitis and septicaemia).
Note. In meningitis there is not always a headache and neck stiffness. There may only be a rash and a fever.
Fungal rashes, such as ringworm or candidiasis, thrive in warm, moist areas of the body. These rashes often appear as itchy, scaly, or circular patches with defined borders.
When not to worry
When to see a doctor
Keywords: fungal skin rash, ringworm rash, itchy rash on skin
Urticaria
Psoriasis
Some rashes are linked to autoimmune or inflammatory diseases such as urticaria, psoriasis or lupus (SLE). These rashes tend to be chronic and may involve thickened skin, scaling, or sensitivity to sunlight.
When not to worry
When to see a doctor
Keywords: autoimmune skin rash, psoriasis rash, inflammatory skin disease
Seek urgent medical attention if a rash is associated with:
Most skin rashes are mild and temporary, but some can indicate infection, allergy, or chronic disease. Knowing the common causes of skin rash and understanding when to see a doctor can help ensure prompt and appropriate care.
If a rash is persistent, painful, or affecting your quality of life, consult a healthcare professional for proper diagnosis and treatment.
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