My son, last month was staying with my mom for a few days. When my son came home that night. He had a red , itchy, rash, pretty much all over his body. That got worse at night. My son, already has Excema and has for 3 yrs now. He also had a low grade fever. Coughing (slight) some sneezing I just thought it was a cold. Anyhow, this cold that I thought was a cold went on for 2 days. His Asthma flared up also. Took him to his Allergist they did skin testing for dog alergy and my son tested positive.
My question is why when my son went to my mom's house again last week he didn't have any allergy or asthma symptoms? when he returned home he had no sign of an allergy problem like the other time?????.. Was the allergy testing wrong????