From your description, it appears to be a case of Pubic lice. It may also be Jock Itch if the itching spreads to nearby areas of inner thighs. Jock Itch is a fungal infection but you get itching any time when you touch the area. Since the medications are different for both, you should contact your doctor and get it diagnosed and use the proper medications. Also since the skin in the area is very sensitive, you should use medicines after consulting a doctor only, even though you get lice lotions over the counter.
Here is a link for you to refer regarding pubic lice:
I am not an expert.Most likely, what you have is scabies or fungal infection. It is easily treatable. You should show it to a dermatologist and get the proper treatment early so that it does not spread to other areas or to others in the family.
By the way, the link I gave you in the previous post also discusses various STDs including Herpes which you can view by selecting from the side bar list. As you can see, herpes produces painful ulcers mostly on genitals and is accopanied by fever, discharge from penis and pain during urination. Though it itches during the initial phase, realtively large painful sores are the characteristic symptoms, in scabies or jock itch, you get many hives like pimples which are mainly itchy.
You may also Google for ' herpes images ' scabies images ' and ' jock itch images ' and compare with what you have.
In any case show it to a doctor.
The Content on this Site is presented in a summary fashion, and is intended to be used for educational and entertainment purposes only. It is not intended to be and should not be interpreted as medical advice or a diagnosis of any health or fitness problem, condition or disease; or a recommendation for a specific test, doctor, care provider, procedure, treatment plan, product, or course of action. MedHelp is not a medical or healthcare provider and your use of this Site does not create a doctor / patient relationship. We disclaim all responsibility for the professional qualifications and licensing of, and services provided by, any physician or other health providers posting on or otherwise referred to on this Site and/or any Third Party Site. Never disregard the medical advice of your physician or health professional, or delay in seeking such advice, because of something you read on this Site. We offer this Site AS IS and without any warranties. By using this Site you agree to the following Terms and Conditions. If you think you may have a medical emergency, call your physician or 911 immediately.