Psoriasiform Drug Eruption to Finasteride: Uncommon Side Effect of a Commonly Used Drug.

Finasteride, a 5-α reductase inhibitor, is generally well tolerated on long-term use and cutaneous adverse events have rarely been observed with the drug. We present the case of a 25-year-old male who developed an extensive psoriasiform eruption within a week of starting finasteride 1 mg for androgenetic alopecia.