tb test question

My husband had a tb test last sat an its been a week later exactly an he went in they felt it said he was good but he's just real worried an so am I, on his forearm he has a dark red circle its a little harder than the rest of his skin. Anyone know if that's normal or should he need to goto the doctor NOW?
Look up interpretation of PPDs at a reputable website like the CDC and call your PCP or the entity who administered the test if you still have questions.Our TOS prohibits giving medical advice.

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