What causes infected blister under the skin near my coccyx?
Patient: There is a scab (bubble scab) on the left side of my lower back close to me tail bone, right above the crack areas at is full of fluid, around te scab under the skin (non visible) feel like it s full of piss or fluid spread out over about 4 inches. It s sore, almost bruise like. The lump had been there for 2-3 years, but the scan has been there for 5 months. What s going on Doctor: HelloWelcome to HCMThanks for posting your query in HCM.Your symptoms are suggestive of pilonidal abscess leading to pilonidal sinus formation.So i would advice you to consult a general surgeon and get physical examination done for confirmation of the diagnosis.It needs drainage and a course of antibiotics.Thank you