I have treated a client’s viral lesion a few times but it’s not going:

When treating viruses, the body also needs to fight the virus and sometimes this works against the treatment.

Viral lesions are the hardest to treat because you are treating the lesion as well as the
virus. In the days leading up to the appointment, it is recommended to do a
pre-treatment to the wart or verrucae to prepare it for the best possible
treatment. The treatment works best when the skin covering these lesions is soft and
slightly opened. Follow the steps below
• Soak the lesion with warm, soapy water for 20 minutes.
• With a pumice stone or emery board (nail file), gently scrub the lesion until the skin becomes rough. (Remember to throw the item away after use).
• Please do not scrub so hard that you make the area sore.
Discontinue these steps if bleeding occurs. You are not trying to open a wound or
cause discomfort. However, the more deeply the jet of nitrous oxide can penetrate, the
better the chances of removal are.

If it has not gone after 6 treatments, leave it for 6 months and get the client to continue a home treatment of applying a salicylic acid preparation and carrying on removing the dead skin.