Hi,Dear,thanks for the query to Health Care Magic.
Dear, your question has following facets which would be replied to satisfy your query.
After meticulously studying your facts and your concerns
following possibilities need to be considered in coming to its diagnosis -
In my opinion this non-painful lump with pus like discharge in actual seems to be Sebaceous Cyst,which reduced after squeezing due to discharge from it.
The squeezing trauma, post traumatic induration and edema,which is the cause of the soreness of the non-painful lump,as rightly thought by you.
There is risk of increasing pain,as the lump has opened up and may close which would cause pent up discharge with post-traumatic blood,getting infected.
So you need to consult your doctor and get it treated by antibiotics and anti-inflammatory drugs.
Its very difficult to think of other probabilities as the facts are very scanty and hence I would advise you to consult a ER Surgeon , who would work out the clinical check up and would fix its diagnosis and its rightful treatment
Don't worry and go ahead as suggested to resolve the lump issue of yours
Hope this would give you confidence to plan treatment with your doctor on your next visit ,which you should plan definitely.
Feel free to ask any further query in this regard to HCM and to ME.
Write excellent review if you feel satisfied with this reply,which would help my rating for the benefit of the other patients.
Wishing early and fast recovery for your lump.
Dr.Savaskar M.N.
Senior Surgical Consultant
M.S.Genl-CVTS.