My 8 month old son has had a low grade fever of 100.3 for the past two days, and last night we noticed he has a lump under his left ear. Nothing under right ear. He has had a cold for about 1 week and we went to the doctor on Thur. and they said he was fine, no ear infection or pneumonia; just a cold. Nurses hotline said mastoiditis, but he has not had any ear infections. Should I be concerned and take him to the doctor, we are going on a 16 hour car ride for vacation in 2 days.
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