Ds (14 months) had his MMR yesterday. This evening, at bathtime, dh noticed three strange looking sores under his arm. They're round with a slightly grazed looking surface. Biggest is almost 1cm in diameter. He's teething, but temperature is fine and he's been happy all day. I've just put him down, but I'm feeling very anxious. Can anyone reassure me? I phoned NHS 24 but they were pretty dismissive.