Hello dear Understand your concern. Following are the causes: 1. Rough sex 2. Allergy to condom that lead to contact dermatitis 3. Hygiene problem: 2. vaginitis: inflammation of the penis, caused by poor hygiene, especially insufficient washing 3. overuse - as in too frequent, too long or too rough sexual activity 4. Fungal infection: in warm environment, if not resolved after2-3 days and associated with foul smells. 5. Urethritis. Take following advice: - use safer sex techniques - Use condoms and lubricants while sex if you have not allergy. - Insert penis in vagina after its get fully wet - Be relax - Wash your vagina with this water twice a day for two to three days with warm water - Salt Bath- Wash your vagina with concentrated salt water whenever you feel the itch. This will give you great relief instantly and prevent further multiplication of bacteria. - Antibacterial/fungal talcs: apply candid powder - Keeping The Vagina Dry (Not wet, clean well) - Wear Loose pure cotton inner wearClothing - Apply anti fungal clotrimazole cream if severe or not resolved. Best regards Dr. Sagar