Fever then rash in an infant

An infant with fever followed by a rash needs close observation because feeding, breathing and alertness can change quickly. Note the temperature and timing, keep the infant comfortably dressed, and watch whether they take feeds and produce their usual wet nappies.

Some viral illnesses can cause fever before a rash, including roseola. Other infections may begin with cough, blocked nose or noisy breathing, such as bronchiolitis or croup. Chickenpox can cause itchy spots that become blisters. A rash that is hot, swollen or painful needs assessment for a skin infection such as cellulitis. These patterns overlap, so an infant's age and general condition matter more than the rash name.

Continue breast milk or formula in smaller, more frequent amounts if needed. Do not force food. Keep the room comfortable, avoid heavy wrapping, and do not give medicines unless a healthcare professional has confirmed the product and dose for this infant. Do not apply unfamiliar creams. Take a photograph in good light and write down feeds, wet nappies, breathing changes and the rash's spread.

Seek emergency help if the infant is difficult to wake, has a seizure, struggles to breathe, turns blue or grey, becomes floppy, or has a rash that does not fade when pressed. Obtain urgent medical advice for poor feeding, repeated vomiting, markedly fewer wet nappies, a swollen painful rash, or any fever in a very young infant. Trust a sudden change in behaviour and seek help even if the rash is small.

Does this infant need to be examined today? Is the feeding and nappy pattern reassuring? What temperature method should we use? Which medicine, if any, is appropriate? What breathing or skin changes mean we should return urgently?