A female has hypopigmented lesions in the centre of the forehead. Drug responsible is?
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.
Hydroquinone
Ether metabolite of hydroquinone
Para tertiary butyl catechol
Para tertiary butyl phenol