Hello
Since ,how many days ,you are having this itching.
As you mentioned that , is it due to STD?
Without
VDRL test,physical examination and complete history ,it is very difficult to say ,whether this itching is due to STD or not.
However , such type of itching may be due to ,these possibilities , these include:
1 Unhygienic care , since there are so many hairs ,if proper care is not taken ( poor hygiene ) may develop itching ,so wash this area with mild degree antiseptic solution or soap.
2 Eczematous
dermatitis may be the next reason , diagnosis can be confirmed by physical examination.
3
Lice may be the another reason ,because this is most prone area for development for lice . Wash this area with permethrine soap .
In my opinion
consult a dermatologist and get his opinion as physical examination is important.
Good luck.