<s>[INST] Hello sir, I have a problem that once I take a tablet for fever and it caused me alergytic.. I consult a doctor and he said I am alergytic to quinolone antibiotics .. After that there is a black mark below my lips .. It happened one year ago. Till now that black mark is there. Is there any solutions for avoiding that mark.... ? [/INST] Hi there Arun. Dermatology is sadly a very visual field & as such, one would prefer a clear digital image of the lesion & you may upload it on this Chat Doctor website using the upload data icon to the right of your screen. You may alternatively try to use a Comic acid based cream in the evenings & a sunscreen in the mornings for best results providing you are not allergic to any of the creams components. Remember to use the sunscreen from dawn to dusk & reapply when sweating or bathing or washing & to be applied each 3-4 hrs.else the pigment lightening cream will cease to be effective. Good luck & here's to a clear skin soon!  Chat Doctor.  </s>