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This appears to be an infection. It is not necessarily related to the type of condom used, but it could be an allergic reaction to latex if you are using it for the first time. The source of the infection could be your partner. Vaginal infections can be transmitted during sexual activity, so both of you should be treated simultaneously to prevent reinfection. Your partner may experience symptoms such as white, yellow, or grayish discharge with or without itching, foul smell, pain at the beginning of sex due to dryness (as lubrication will be reduced), and pain towards the end when the fully erect penis touches the innermost part of the vagina (due to inflammation of the structures around the uterus). Pain may radiate to the back or thighs. Other associated symptoms of infection may include bowel movement issues and features of gastritis. Menstrual bleeding may become thicker, darker, and have a bad odor, and there may be more days of spotting after the periods. The throbbing pain may occur even before and after periods. Before starting treatment, it is important to confirm that she is not pregnant.
I suggest that both you and your partner take the following medications,
Tablet Fluconazole 150 mg (single dose, no repetition) after lunch.
Tablet Azithromycin 1 gm (single dose, no repetition) one hour before food,
Tablet Secnidazole forte 2 tablets (single dose, no repetition) after dinner. Both of you should take these medications on the same day.
Later on, she can take a capsule of Doxycycline 100 mg twice a day for 1 week,
Use a vaginal wash twice a day, and insert a vaginal pessary such as capsule Clingen forte (Clotrimazole and Clindamycin) once at night for five nights.
You can apply any antibiotic and antifungal cream such as Candid B (Clotrimazole and Betamethasone) on the penis twice a day after washing for seven days.
Taking the tablet Cetrizine (Cetirizine hydrochloride) once at night can help reduce any allergic reactions.
Consult your specialist doctor, discuss with them, and take the medicines with their consent. Refrain from having sex until the infection is fully resolved. It is important to treat the infection promptly, as delays may result in the infection spreading and potentially affecting future fertility for both you and your partner. Do not attempt to forcefully pull back the foreskin, as this may further injure the skin and worsen the infection. To reduce swelling, you can gently pour cold water onto the penis for a short time or sit in a tub filled with cold water. Avoid using hot water, salt water, or antiseptics, as these can further harm the skin and soft tissue.
I hope your queries are resolved and any further queries are welcome.