Nappy rash can be caused by:

• your baby's skin being in contact with wee or poo for a long time
• the nappy rubbing against your baby's skin
• not cleaning the nappy area or changing the nappy often enough
• soap, detergent or bubble bath
• alcohol-based baby wipes
• some types of medicines, such as antibiotics or laxatives (used to make a baby poo more often)

There may be red patches on your baby's bottom, or the whole area may be red. Their skin may look sore and feel hot to touch, and there may be spots, pimples or blisters.

Most babies with mild nappy rash don't feel sore, but if the rash is severe your baby may feel uncomfortable and be distressed.