Puberty

I probably have a puberty deviation. I am 16 years old, and my penis is 4 cm long, erect - 12. Will it grow, or will it not grow?

I am 13 years old, my scrotum itches very much, what should I do?

I wash every day, wash the eggs well. Recently, before starting to itch, hair began to grow on the scrotum and around. If it is related to hair growth, how can you reduce itching? How to make it less itchy? How to smear? How long will this last?