If this is the case, it is best to bring your son to a dermatologist. An intralesional injection of corticosteroid directly into the inflamed pimple may hasten the decrease in swelling and redness.Oral medications and application of prescribed medications on the face may help improve the condition.Avoid application of any medications for the moment and refrain from unnecessarily touching the face. Washing the face with a mild and bland soap may be able to help until the dermatologist prescribes a new set of topical medications.
Is it true that cortisone injections may cause a dent in the skin at the point of injection?
With a certified and experienced dermatologist I think that the risk is minimal. With regards to scarring, I feel this is more of a result of the severity of the pimple rather than the injection itself. Scars develop when dead cells ar replaced by new skin and this process causes the uneven surface usually seen . If the pimple gets infected and stays unmanaged fo a long time, this may cause more scarring.However, this varies from person to person.They usually use a very fine needle to inject the drug.
Discuss your concerns with your dematologist.If this is an inflamed and infected pimple then the injection may help.