benign

adj. non-malignant; favorable; kind, gentle; compassionate

Benign (from the Latin roots bene- = "well" and -genus = "born"), a polyvalent term (refer ), is employed with a specific denotation as a medical term in medical discourse to describe a mild and nonprogressive disease. The term is most familiar as a description of a non-cancerous (non-malignant) tumor or neoplasm, but may also refer to other mild health conditions.
See more at Wikipedia.org...

Adjective
1. not dangerous to health; not recurrent or progressive (especially of a tumor)
(antonym) malignant
(classification) pathology
2. pleasant and beneficial in nature or influence; "a benign smile"; "the benign sky"; "the benign influence of pure air"
(synonym) benignant
(antonym) malign
(similar) harmless, nonmalignant
(see-also) harmless
(attribute) benignity, benignancy, graciousness
3. of disposition or manner; "the benign ruler of millions"; "benign intentions"
(similar) kind

(a.)
Of a mild type or character; as, a benign disease.
  

(a.)
Of a kind or gentle disposition; gracious; generous; favorable; benignant.
  

(a.)
Exhibiting or manifesting kindness, gentleness, favor, etc.; mild; kindly; salutary; wholesome.
  

Not cancer; does not invade surrounding tissue or spread to other parts of the body.