Hello Sir,i Have Problem Of Itching On Whole Body,especially On

Hello sir,i have problem of itching on whole body,especially on skin of penis.i am using scarab lotion for body,and Neo Clobinate GM for penis as suggested by a medical shop specialist.i have n't went to any doctor yet.But there was no good result by using these.So what can i do?.Mainly on my penis the skin became dry,broken and black spots on it and it is itching a lot,some times i feel itching inside the skin of penis,and some times i feel like it is burning,and fore skin of penis is also very much itching.what may be the problem? Is there any serious problem long run?what can i do now? please tell me your suggestions. If it is needed i can visit doctor,but which doctor do i need to consult,i mean skin specialist or any separate specialists are there for this type of problems?please tell me your suggestions which medicines to use etc.,thank you sir.