Stop the pen: Use a Hydrocortisone cream if you think you had an allergic reaction.
Answered 6/25/2014
4.2k views
Acne pen: You may have had an allergic reaction or simply an intense response. Stop using the pen. Since it is only one day, i'd watch and see how the lesion progresses. If symptomatic, you can use a topical cortisone cream. Best, of course, is to see dr if problem persists or gets worse.
Answered 4/15/2015
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