Inflamed, sore. rash on penis, will this go away without being seen?

Diseases and infxn: Psoriasis, eczema, lichen planus/sclerosis, skin cancers are example of diseases coming from your body. Fungal infection/balanititis, herpes, warts, syphilis are examples of infectious processes your have aquired somewhere/somehow. It is difficult to tell what you have based on your question. I recommend getting it checked out by your doc. Good luck.