Hi, welcome to the ehealth forum and I am glad to help you.
You seem concerned by the lump draining pus on right upper back for the last 1 week.
There seems to be the possibility of infected ruptured cyst, might be infected sebaceous cyst and you might need a course of antibiotics for which you must consult your personal physician as the definitive diagnosis is not possible online.
Hope this helps. Take care.
Note: This post is not to emphasise final diagnosis as the same cannot be made online and is aimed just to provide medical information and no treatment suggested above be taken without face to face consultation with health care professional.
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