Hello and Welcome to HEALTH CARE MAGIC, I have gone through your query. The white spot surrounded by redness that you referred to seems to be a purulus which contains pus within. It might be discharging or if not you can take a sterile needle to prick it so as to relieve the pressure within the tooth. This will also lower the intensity of Pain. The purulus suggests that your tooth is infected and most probably there is periapical lesion as well which will be seen via X-Ray. Yea you can take the medicine as the same has no affinity with the drugs you mentioned. Your Tooth might need a Root Canal in this Case as the infection can only subside for some days or week by medicine and it(pain) will recur. You might be needing an X-Ray of the involved tooth to see the extension of infection, so the dentist can see whether the tooth really can be saved with root canal or should be extracted. I suggest you to visit the Dentist and get the tooth treated. Thanks and Regards, Dr Himayun