Brief Answer:
might have been an abscess formation

Detailed Answer:
Hi,

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Yellowish bruise and a small lump- This is because, there might have been an abscess formation. So, you need antibiotic course to prevent further infection. If severe, surgical drainage may be required but a Physical examination is mandatory before commenting about drainage.

can only feel the lump wen my arms are down if i lift my arm up the lump goes- This is because, the swelling might have occured on a muscle usually pectoralis major is located there, so it varies with muscle movement.


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