Do you recognise this adverse drug reaction?

Hint: The patient is being treated for rosacea

A 58-year-old male with a history of rosacea presents with blue-black discoloration on his neck and face that worsens after sun exposure. 
What drug is the most likely cause of this reaction? 

  • Silver sulfadiazine
  • Azelaic acid
  • Amiodarone
  • Minocycline

You can check your answer under the image