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If the symptoms are instant after intercourse, and persist even if condoms are not used, then it could be attributed to infections, vaginal dryness (hormonal changes), other skin conditions, etc. If the symptoms occur only after use of condoms, then latex allergy could be suspected. The exact cause can only be made out after thorough evaluation. Consider visiting your doctor/gynecologist at the earliest for further evaluation and assistance. Treatment as appropriate (based on the examination findings and investigation results) would be started to help you. Drink plenty of water. Take adequate rest. Avoid vaginal douching, use of harsh soap or perfumes in the area. Use loose cotton undergarments and avoid use of tight fitting clothes. If infective cause is detected, get your partner also treated simultaneously to prevent chances of re-infection.
Take care.