Hi  Welcome to Healthcare Magic Forum  You seem to have pigmentation in underarms.  Topical medications can definitely be of help to you in reducing the pigmentation to some extent, although only after proper treatment, we can know the results  Since these are dark scars, I would advice that you should use a lightening agent like kojic acid and vitamin c combination over the scars. This is a simple, harmless lightening agent which can be used for as long the blackish pigmentation is there..  Also ,try not to touch the area too much  Take a diet rich in vitamin C and antioxidants like Citrus fruits and lots of salads  If after all the above measures, the scars tend to persist, then I would advise that you should see a dermatologist as there are various other measures for the treatment of pigmented scars like the use of chemical peels, dermabrasion etc which a dermatologist can decide according to the type of scars. Hope it helps  Wishing you speedy recovery  Dr Geetika Paul