Abscess in glutial regian. Problem!

Hello sir Is der any chances to get abscess in glutial Region swelling after taking injection on that place.. Because Now we confused my sister taken injection diclofenac for weakness in hospital on leg backside in glutial earlier she have some pain sometimes in glutial But since after taking injection the place was swelling and redness with pain coming we used so many tablets since 15 days no use finally doctor said its not a injection way problem.. Saying have to show to surgean doctor May I know sir which doctor we have to show surgean men's ortho or gastro or what department Pls suggest And is der any chances after injection for abscess comes out like little type like button swelling red.. And what is the fees approx happen  they take to remove if abscess problem