It's possible for someone to be allergic to their partner's vaginal discharge.
While not as common as allergies to pollen or pet dander, allergic reactions to vaginal discharge can occur.
These allergies are usually triggered by proteins found in the discharge, which can cause symptoms like itching, redness, and swelling in the area of contact.
If your boyfriend is experiencing these symptoms after intimate contact with you, it's important to consult a doctor to rule out other possibilities and receive a diagnosis.
They may recommend allergy testing to confirm the cause and suggest treatment options, such as avoiding contact or using barrier methods like condoms.