Ok as you can see I have what i think to be GDA (maybe not) and ive tried the leave it for 3 weeks and see if it goes away and this is the result still here. Do i now rub it off or will it eventually go away. Ive had it for now hmm around 4 to 5 months off and on but ive always scrapped it off when it got too much tough. Any help would be great. THanks.