Which of the following is not true about hydroquinone?
It is a weak hypopigmenting agent
It inhibits tyrosinase
Response is incomplete and pigmentation may recur
It should not be used for melasma or chloasma of pregnancy
Ans. is'd'i.e., It should not be used for melasma or chloasma of pregnancy .Ref: KDT Vhle p. 8921Hydroquinone:It is a weak hypopigmentation agent.Inhibits tyrosinase and other melanin forming enzymes, decreases formation of and increases degradation of melanosomes.Regular application (as 2-6% lotion or cream) for months is required in melasma, chloasma of pregnancy, etc.