Welcome to HCM.
It seems form your problem that you are suffering from fungal infection
. This is a simple problem in this area where we do have moisture for the proliferation the fungus known as candidal Balanoposthitis
(on penis) and tinea cruris
(on abdomen). Kindly wash your penile area twice daily by retracting your foreskin. If you are sexually active man then should take care of your partner who my be having white discharge problem. she should also be treated properly. Both of you can take a course of anti fungal creams and oral anti fungal for around 15 days. other than that wear lose cotton clothes to prevent infection other sites of body.
With best health wishes,
Dr Sanjay K Kanodia