Black gums is not a disease until it's excessive melanin pigmentation( melanoma or any other thing) or any drug you are on . A picture might better clear the situation.  You will have to visit a dentist to confirm what it is... Also it's never like impure blood collection or need to be removed. Black gums generally does not have any problem and it depends on colour of your skin... Majority of cases it's in significant and not harmful... Also depigmentation is possible. Consult your dentist will guide you .

Black gums can be due excess melanin pigmentation whck makes our skin light or dark. Excess deposit of this pigment can cause blackness of d gums. It will not harm you. Get a cleaning done if possible and the dentist will clear ur doubt as well

Normally the colour might be black if you have any habit of smoking and if you dont have the habit u should consult your nearby doctor at the earliest before it can get critical