<s>[INST] on my right middle finger there is a lump turning purple and in the middle of the lump there is a large white area that looks like there is pus underneath the skin. it is extremely painful and is getting bigger and hurting more everyday I have had it since Tuesday 11th feb 14 [/INST] Hi.based from your description, it could be a cystic formation (tedious or gelatinous type) or a fibrous tissue formation. A consult with a doctor, preferably a general or an orthopedic surgeon, is best for physical examination and clinical evaluation, especially if the lesion is increasing in size and causes you discomfort. Diagnostics (such as X-ray) and management (medical and/or surgical - excision of the lesion) will be directed accordingly. Hope this helps. Good day!!~ Chat Doctor.  </s>