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Bar Rot or paronychia is treated by:(from wikipedia.com)

Warm soaks can be used 3 or 4 times a day for acute paronychia to promote drainage and relieve some of the pain. Most cases of acute paronychia should] be treated with antibiotics such as cephalexin or dicloxacillin. Topical antibiotics or anti-bacterial ointments do not effectively treat paronychia. If there is pus or an abscess involved, the infection may need to be incised and drained. Rarely, a portion of the nail may need to be removed.

Chronic paronychia is treated with topical antifungal medication such as ketoconazole cream. A mild topical steroid like hydrocortisone may be added to the antifungal medication to help reduce inflammation. Steroids should never be used alone on a chronic paronychia.

Yvonne57

Gosh that looks like it hurts. I would lance that thing if it were me!