Hi, welcome to HCM...
You are having sebaceous
cyst with secondary bacterial infection. Pain and
redness suggest bacterial infection.
In sebaceous cyst, the semi-fluid content of the cyst looks a bit like toothpaste. This substance is soggy keratin. Keratin is made by skin cells and is the substance that hairs are made from and the substance that covers the top layer of the skin.
Sebaceous cysts are benign. That is, they are not cancerous, do not spread to other parts of the body or cause any serious problems. Very rarely, a
skin cancer may develop from sebacoeus cyst.
In your case , sebaceous cyst is infected with bacteria. So, first of all, you should take short course of antibiotics and anti inflammatory drugs.
If required, the cyst can usually be easily removed by a simple operation, under
local anaesthetic. The surrounding skin is numbed by injecting some local anaesthetic. A small incision (cut) is made over the cyst. Typically, the cyst can be easily pulled out. The wound is then stitched up. A small scar will result. Sometimes, after the removal of a cyst, it gradually regrows in the same site under the scar. This is unusual but, if it occurs, it can be removed again.
I hope you got my answer...
Regards.
Dr.Ilyas Patel MD,DVD