Hi.Thanks for your query and explanation.
The blackhead was extracted and you have got a problem after 1 month that there is little bit of pain and discoloration.
It looks you are getting antibiotics, add on anti-inflammatory medicines like Ibuprofen and take multivitamins as they work as anti-oxidants.
It is possible that the blackhead was removed partially, the sac remained there only to be infected later or there is infection of another gland.
Hope this helps you.
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