<s>[INST] Hello doctor,I had sex with my fiancee 14 days back without protection and it was her third day of period. Three days after having sex, I got a sore on my lips. I am confused that it happened because of cold or is it something else and from that time continuously, I have a sludge kind of cold. Please find the attached sore image and suggest. [/INST] Hello. I have gone through the image (attachment removed to protect patient identity). The lip outer layer is slightly red. It does not seem to be due to cold. It may be due to allergy. For the allergy, you can apply lip balm. I suggest taking tablet Recofast plus (Paracetamol, Pseudoephedrine, and Triprolidine) two times a day after food for three to five days and tablet Montek 10 (Montelukast) one at night for five to seven days. Consult your specialist doctor, discuss with him or her and start taking the medicines with their consent. For more information consult an HIV AIDS specialist online --> </s>