Re: brown spot or age spot
See a Dermatologist. He will know what to look for regarding treatment.
Do not interfere with it yourself.
I have had four similar looking moles removed, a biopsy is initially done to see whether it is malignant or non-malignant and then a decision is made whether to remove it or leave it alone.
In my own case all were N.M. and were treated by freezing method.
It is always wise to get these moles looked at even if they prove to be safe.
Hope this helps you,