Appeared suddenly, hard to the touch 

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Like most things like that, (and I have been having an issue with some skin ailment)
consult a Dermatologist, as soon as you can
A bite. Maybe a horse fly. Where do you live?
Opinion
3Opinion
Looks like maybe a botfly
Please go to doctor..
You need to show that to a doctor.
Staph maybe
A blackhead cyst
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