Hello, Rashes in the penile shaft are commonly due to skin irritants, latex, condoms, harsh soap or body lotions, plants, chemicals, pet saliva, food, STI s, herpes, etc. Contact dermatitis can also cause rash in the shafts. Keep away from substances like colognes, spermicides, soaps and detergents. Seriously care about your hygiene. Avoid any type of sexual activity. You can apply ointment Acyclovir on the area affected to keep symptoms under control. You can apply ointment Hydrocortisone to reduce itching. Get clinically examined by a urologist, get STIs, and tests for herpes done it test reports are positive you will be treated with antibiotics and acyclovir. Tip of the penis itching may be due to jock itch; you can apply ointment Clotrimazole or Miconazole on the area affected. Taking antihistamines at bedtime may also help reduce itching. In case STIs test reports are positive, you will be treated with antibiotics and antivirals. Take care. Hope I have answered your question. Let me know if I can assist you further. Regards, Dr. Nupur K., General & Family Physician