How long does it take to develop purpura with cocaine use?

Levamisole: Most of the time the cause of the purple discoloration of skin due to bleeding under the skin (called purpura) after Cocaine use is because of a chemotherapy and antiparasite drug called levamisole that is intentionally added by importers of Cocaine as a cutting agent to reduce expense & increase bulk of their product. It is often described as 'sudden onset' retiform purpura so shortly after use.