iam 40year old women 79 kgs 154cm height- diabatic,had removed,uterus &both overies 2 years ago-i have few boils in different patrs of my body , some of them are 4 years old and it is a brown color kind of hard skin ,n the intial it was a kind of pimple but later its stays as it is ,as hard lump skin, can you advise me please.?