Alfie has been attending the vet weekly because of the histiocytoma. He's had 2 courses of antibiotic tablets and 2 long lasting injections as well as anti-inflammatory injections, piriton and fuciderm. Alfie had it aspirated 2 weeks ago and I was relieved as the results came back that it was benign. In the week following that it appeared to shrink a bit and darken in colour but last week it seemed to fill up again & he had a raised temperature. The vet has checked it again today and there is no change in its appearance or size from last week so she is giving it another week and if it's still the same and not reducing in size then she wants to proceed with surgery. Of those of you who said their pet's histiocytoma disappeared on it's own, i wondered how long it took? It will be 5 weeks next week since Alfie's lump first appeared.