Can flat warts feel slightly rough to the touch? are there home remedies for removal?

Yes: Flat warts are usually flesh colored and slightly raised and tend to occur in lines and patterns from scratching. They are treated with a variety of different techniques including freezing with cryotherapy, electrocautery, or creams such as retin a (tretinoin) or aldara. See a physician to make sure that this is the issue and to discuss the best option for treatment in your case.