Most childhood rashes come from harmless viral infections or skin conditions like eczema and settle on their own. However, some warning signs need urgent attention. Get emergency help if a child has a rash of red or purple spots that do not fade when you press a glass against them, especially with fever, drowsiness, a stiff neck, fast breathing or a dislike of bright light, as this can indicate meningococcal infection.
Also seek urgent care for a rash with swelling of the face, lips or tongue, difficulty breathing, widespread blistering or peeling, or if your child seems very unwell, floppy or hard to wake. A rash with a high fever in a baby under three months always needs prompt assessment.
For a child who is otherwise well, with a mild itchy or localised rash, you can usually monitor at home and ask a pharmacist or arrange a routine doctor's visit if it persists, spreads, or you are unsure. Trust your instinct; if your child looks seriously unwell, seek help regardless of the rash. This is general guidance, not a diagnosis.