First of all swelling.warmth.redness occur and some times boils are formed in random manner in the lower portion of left leg and it convert to a big hole in the left hill.pus.blood come from that hole.smels durty .too much hot in the iinfected area and always feel  like fever .the infected area is senseless.but the hole again fell in several weeks or months .some times pains a lot.plz give  suggestions what can we do .the hole process continued last 27 years .it feels fully cured but again formed within a short intervel.some photos are given bellow of the infected area.