hypopigmentation 
noun [mass noun]
Inadequate pigmentation of the skin.The other major side effect of cryosurgery for this lesion is hypopigmentation....
- Side effects are few, but may include tendon rupture, infection, steroid flare, hypopigmentation, and soft tissue atrophy.
- Once the lesions have resolved, there may be transient hyper- or hypopigmentation.
- impresario
- imprescriptible
- impress
- impressible
- impression
- impressionability
- impressionable
- impressionableness
- impressionably
- impressional
- impressionism
- impressionist
- impressionistic
- impressionistically
- impressive
- impressively
- impressiveness
- impressment
- imprest
- imprimatur
- imprint
- imprison
- imprisoned
- imprisonment
- impro