I had a "low risk" possible exposure 6+ months ago (mutual mast., protected oral) with female of unknown status - no genital-genital contact. Tested neg at 45 day, standard antibody test (presumably) given at a US hospital lab. Am now suffering from dermatographia - allergy skin tests are reactive, however I experience no hay fever which seems odd. Only itchy skin, no rash, with dermatographia. Cetirizine stops the itch but it returns when I am off the drug. I am aware that I am at a low risk but please tell me whether this symptom is a possible complication of HIV infection. Thanks.