Hi..thanks for writing here.Since you got black spot after using antibiotic spray,it is possible that you have developed dermatitis
and you have to apply atopical steroid
like momate cream for 1 to 2 weeks,also apply sunscreen at day ,avoid any cosmetics on face ,patch will fade away ,but it will take some time.For your freckels you can either go for laser
or simple phenolisation.Sun protection is the rule in any cosmetic treatment.There are many effective lasers and if done properly give excllent results without any scarring.since you have got freckles in lip area get your ultrasonography
for abdomen done,since there are some polyps which may be related to it .