Did you get that dark spot at the site of injection? It happened to me, when at injection sites I'd get dark pretty noticable patches. I stopped using melanotan 2 for a few months but they didn't dissapear.. So I thought, I will just get another vial of melanotan 2, this time I was injecting IM in my triceps, and I didn't get those dark patches anymore. The more tanned I became the less visible those dark spots was, and now they have completely dissapeared. I don't know if they will appear again if I stop using melanotan but I don't plan to stop it in the near future