<prompt> A female has hypopigmented lesions in the centre of the forehead. Drug responsible is?HydroquinoneEther metabolite of hydroquinonePara tertiary butyl catecholPara tertiary butyl phenol  <response>: This is a characteristic chemical leukoderma caused by the use of bindi due to its characteristic location centre of forehead.Para tertiary butylphenol PTBP is present in the adhesives of the bindi and result in leukoderma.REMEMBER: Most potent agent causing chemical leukoderma is Monobenzyl ether of hydroquinone. 