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Thanks for your response.
No pinpoint hole on it no. I usually try to pop it every few days (I prob shouldn't but I can't resist). The skin at the top usually just breaks and the material is usually thick and yellowish (like a normal acne spot). Then I leave it and after few days skin heels again but I can feel the bump is still there. It is slightly red around the edges but doesn't hurt or painful to touch no.