A million-dollar wound or Blighty wound is military slang referring to a type of wound received in combat which is serious enough to get the person sent away from the fighting, but is not fatal, nor will it leave the person permanently crippled.
In conclusion, Benadryl does not cause kidney damage directly, but if you uses excessively over a long period of time and there is urinary retention, the chronic urinary retention could ending producing kidney failure.
When ready, pour the ointment into a suitable container, wait for what is considered an overdose of benadryl to cool and then close the container. Use: Apply the ointment in a thin layer and gently massage the affected area with movements in the direction of the heart.