Skin rashes can have many causes — from allergies and infections to chronic skin conditions. A medical assessment helps identify the right treatment.
Medically reviewed by Adi Zoabi, Approbation als Arzt.
Last reviewed on August 31, 2026. Updated as clinical guidelines change.
A skin rash is a visible change in the skin that can appear as redness, itching, scaling or blisters. It often develops suddenly and affects either isolated spots or larger areas of the body. Many rashes are harmless and clear up on their own, while others point to a cause that needs treatment. How it progresses depends largely on what triggered the rash.
Among the most frequent triggers are allergic reactions, for example to foods, medications, skincare products or plants. Infections caused by viruses, bacteria or fungi can also lead to rashes. Chronic skin conditions such as atopic dermatitis or psoriasis play a role as well. Irritation from heat, sweat, friction or stress can further promote the condition. Sometimes the exact cause remains unclear at first despite examination.
Have a rash checked by a doctor if it spreads quickly, is very painful, weeps or oozes pus, or does not clear up after a few days. Warning signs such as high fever, a general feeling of illness, or a rash appearing after starting a new medication call for prompt evaluation. Call the emergency number 112 immediately if you experience shortness of breath, swelling of the face or throat, circulatory problems, or a rapidly spreading rash with high fever.
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Medical notice: Not a substitute for an in-person medical examination. The information on this page is intended for general guidance only. In an emergency, please call 112.
Yes, many skin rashes can be assessed by video consultation. It is best to send photos of the affected areas in advance.
Seek medical help immediately if the rash is accompanied by fever, shortness of breath or severe swelling.
