Itching could be a sign of poor hygiene or a fungal infections. If you have itching followed by some local wetness, it is fungal infection. You will need to go to a dermatologist to get treated as one cannot prescribe on such a online platform
Generally people dont go to dermatologist as they feel the creams advertised on TV, magazines etc can cure them. They do help control the infection, but its not a cure.
So visit a dermatologist ASAP
Next Steps
Nature has kept the sperm producing testes outside the body as sperm production needs a lower temperature than that of the body. Keeping the area well aerated, avoiding wearing underwear while sleeping, and washing the groin area well with soap and water is best way to have good hygiene around the penis