My dog has a histiocytoma on the side of her foot, it is quite large and she is on her 2nd lot of antibiotics.  The vet has done a cell sample and is happy to leave it at the moment because these normally go on their own accord. I am happy with all this as one of my other dogs had one on his leg and it did go but seemed to take ages.
Anyway what I would like is any useful tips to help it on its way.

My dog had a histiocytoma as well.  The vet gave me some cream (I can't remember the name, but I believe it may have been a steriod lotion) to rub on it twice a day.   I am not sure it made any difference whatsoever, but nonetheless the histiocytoma resolved itself and has not reappeared.

Unless your vet thinks there may be an infection or the tumour has ulcerated, antibiotics are of no benefit for histiocytomas in terms of making them disappear any quicker.

Thanks for your response.

She is on antibiotics as it is ulcerated, unfortunatly it's on the side of the foot so she does catch it sometimes.