Chafing can be a common problem when wearing a wetsuit, especially if the suit is ill-fitting or if the wearer is not wearing the right type of clothing underneath. To prevent chafing, it is important to choose a wetsuit that fits well and to wear a base layer or rash guard that is made from a smooth, non-abrasive material. Applying a lubricant like petroleum jelly to areas that are prone to chafing can also help reduce friction and irritation.