Girls, hello, I can't understand the situation. The son got sick, the …

Girls, hello, I can't understand the situation. The son got sick, the thermometer shows 38 degrees but his forehead is cold, his head is also cold, his arms are warm but his legs are also cold. It feels like there isn't such a high temperature. For curiosity, we measured with my husband, he has 37.7, and my husband has 37.1, but we don't have a fever, could a mercury thermometer be wrong?