<s>[INST] Hi, I ve had this small bump on my triceps for about 3 months, it fills up with a small string like strand of white puss. I squeezed it out every time. Recently I squeezed the puss out and blood came out follow by minor swelling, and a bruising sensation on the bump [/INST] Hi, dairy have gone through your question. I can understand your concern.  You may have some abscess formation or some inflammatory lesion. You should go for Chat Doctor.  If needed go for culture and sensitivity testing.  It will give you exact diagnosis.  Then you should take antibiotics treatment accordingly. Consult your doctor and plan accordingly. Hope I have answered your question, if you have doubt then I will be happy to answer. Thanks for using Chat Doctor. Wish you a very good health. </s>