too many risk factors altogether oral sex,cold den smoking, swollen lymphnodes u r nt letting ur body to fight back. take a break .u need
vitamin B12 supplements for wat u hv got on corners of mouth. if sore is painful ulcerated apply Metrogyl gel over it thrice a day. U might need antibiotics depending upon hemogram reports.
Next Steps
keep the practice hygienic as much as possible avoid use of chemical product while such practices since de r known to cause allergic reation
Health Tips
get a hemogram done and cosult