Had bad bronchitis lately woke up with a huge bruise on side?

hi my husband is a 45 yr old male who has had bad bronchitis lately and has been in and out of the ER lately for it. They have had him on steroids and has had some discomfort in his sides but today he woke up with a huge bruise the size of a mans shoe on his side and he hasnt fallen or run into anything

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