<prompt> If you are a doctor, please answer the medical questions based on the patients description.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  <response>: 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 andor surgical - excision of the lesion will be directed accordingly. Hope this helps. Good day!! Chat Doctor. 