<prompt> A patient presented with scarring alopecia, thinned nails, hypopigmented macular lesions over the trunk and oral mucosa. The diagnosis isPsoriasisLeprosyLichen planusNone  <response>: Most of the guide have given lichen planus as the answer.But, None of the given option is fully correct.Patient in this question is presenting with -Scarring alopeciaThinned nailsHypopigmented macular lesionsInvolvement of oral mucosaPsoriasis and pemphigus are out of question as these two dont cause alopecia.Two options left are leprosy and lichen planus, both can cause scarring alopeciai. Thinned nail and oral mucosal involvement favour lichen planus as diagnosis, but the lesion of Lichen planus is hyperpigmented, i.e. hyperpigmented violoceous plaques and surrounding hyperpigmented macules.ii Hypopigmented macule can occur in leprosy, but nail thinning rule out leprosy.So, No options is absolutely correct.If we consider that there was misprinting in the question i.e. hypopigmentation instead of hyperpigmentation, than you can go ahead with lichen planus. 