Discoloration of eyelashes after lash serum. Will this go away on it's own? Suggestions? (photo)

I put this Q under latisse as it’s is similar but non prescribed. It’s called UK lash and was using it for a few months then noticed discoloration on my eyelids so stopped using three months ago. I don’t think it’s improved since I stopped using it. Will it go on it’s own over more time? Or should I buy a lightening cream and if so, please could you recommend one? Please see photo