Will you be ever allowed to tan again after Cosmelan?

Melasma is exacerbated by exposure to the sun and Cosmelan is used to treat melasma. If you don't want to have melasma then you need to wear a good sunscreen and not tan. Otherwise - boom - your melasma will reignite. "This answer has been solicited without seeing this patient and cannot
be held as true medical advice, but only opinion. Seek in-person
treatment with a trained medical professional for appropriate care."

Melarase creams should be used for several months after a cosmelan peel in order to minimize the risk of long term hyperpigmentation.
Best, 
Dr. Karamanoukian
Realself100 Surgeon