I want to increase my penis girth , it is 4 inch?

Variable results: Rarely, surgery is performed for penile enlargement by a plastic surgeon or urologist. Allografting fat or synthetic compounds can increase the girth of the penis, but with the risks of surgery like bleeding, infection, etc. I recommend you talk to a doctor that performs this surgery for more information.

Penis size: I would learn to be satisfied with what you have. Unless you had micropenis or an actual deformity - surgical interventions are not recommended. Stay away from pills, potions and lotions that will only reduce the girth of your wallet.