Hi,
While a quick fix is often requested for by patients, it is best that acne inflammation be controlled over a longer term rather than temporarily suppressed with cortisone injections which may cause unwanted side effects such as skin thinning and whitening.
Methods to control acne inflammation include topical benzoyl peroxide, tretinoin, adapalene as well as oral medications such as antibiotics and isotretinoin.
Realistically, it will take at least 4-6 weeks of treatment before clinical results are seen.
Do refer to the Acne section to learn more about the treatment options for inflammatory acne.
Hope this helps!