I have a lump on my back, it is in the same spot that I used to have an open pore that I would have squeezed and white stuff would come out for the past 20 yrs, a few days ago I noticed a lump perturbing out of that spot, I did have someone squeeze it, lots of puss came out then blood , but the hard lump is still there, Is this a concern, should I see a doctor for this?