The answer to the strange lesions seen on the patient in yesterday's image challenge is #5 - bleomycin reaction. The patient was treated with intralesional bleomycin for a lesion on her tongue. Within a week she developed painless, non-itchy hyperpigmentation on her trunk.
Bleomycin is a medication that is used for certain types of cancer. Twenty percent of patients treated with bleomycin have such a reaction.