Itchy testicles can be caused by a few things. One of the most common causes is a fungal infection, which generally presents as a reddish rash. It could also be a result of chafing, using new soaps or detergents that you might be reacting to, or some STIs. Make sure to keep your genital area clean but don’t use any harsh soaps. If a rash appears or the itching is intense and continues for several days, we recommend making an appointment so a medical provider can check you out.