Is my child's rash contagious?

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It depends entirely on what is causing the rash, and that is the honest answer anyone should give you without seeing it. Rashes are a description, not a diagnosis. Some common childhood rashes are contagious: chickenpox spreads easily until every spot has crusted over - the AAP's symptom guidance notes that takes about 7 days after the rash appears - and hand, foot, and mouth disease circulates through daycares. Others, like eczema, heat rash, hives from a food reaction, and contact rashes, spread to no one.

A few clues help you think about it before you see anyone. A rash plus a fever and a sick-looking child suggests infection. Itchy raised welts that come and go within hours suggest hives. A rash only where skin touched something new - a plant, a detergent, a metal - suggests contact. And timing matters: did it start after a new food, medication, or illness?

Some rashes skip the guessing and go straight to urgent care: purple or blood-colored spots that do not blanch when pressed, especially with fever, any rash with trouble breathing or swelling of lips or tongue, or a rash with a stiff neck or a child who is hard to wake.

An online clinician can look at photos and help you narrow it down. Pymander is a free AI doctor, 24/7 by text, and can help you sort the pattern before the visit.

Is my child's rash contagious?

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