Genital skin problem

I am a 21 year old male.

My genital skin ( scrotum area and area under penis shaft ) have become blackish in color and often becomes very hard. Other genital skin area around it is not blackish. Various skin 'foldings' (striped layers) and small circular cavities are all over the affected area. Also i observed small light black patches on lower scrotum area (near the anus). The whole area looks abraded. I have never had sex. Also  i clean my genitals everyday.

Is this some disease ? Please tell me a cure to bring my genital skin back to normal.

Thanks.