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Mumsnet hasn't checked the qualifications of anyone posting here. If you have medical concerns, please seek medical attention; if you think your problem could be acute, do so immediately. Even qualified doctors can't diagnose over the internet, so do bear that in mind when seeking or giving advice.
I had a lump under my arm not so long back that became infected, consequently I developed a red patch (not line though). But the main reason i knew I had an infection was due to how I felt, temp, shivers etc. How is he in himself, if he is unwell then get him to the docs for some antibiotics as my infection made me unwell very quickly, hth