Growth or bump

Hello Vets, Three weeks ago I've found a growth on my dog's penis. It was not there long time back because I am checking almost daily my dog everywhere for any potential issues. This bump does not mind him, he is not licking and does not have any pain. Since 3 weeks it did not grown bigger but not decreased either. I've been to my vet and they decided to take a sample of it and make a biopsy to see if it's malignant or benign. So anesthesia and then the con for a week. Fortunetly it is not cancer. The Lab report says: "Severe, diffuse, superficial and deep chronic macrophagic lymphocytic inflammation with protozoal/fungal structure". The Lab recommended to further investigate to evaluate presence of Leishmania infection. This is a big surprise for me, because here in Belgium Leishmania does not exist and I have been with the dog in Spain 6 years ago where this parasit was present. But my dog never had any issue so far until now. Anyway, after this report, I have done full, complete blood tests which were quite expensive (in total everything cost a lot, as you know). The bood test were fine and negative to Leishmania spp. Now the vet and Lab still want to investigate on the same and take another sample of tissue - so again anesthesia and con afterwards, very annoying for my poor boy. They want to see if the parasit is in the tissue and they would also (hopefully) look at possible champignons/fungal elements. I am asking here for maybe another advice or opinion, I know that just by looking at a photo is not possible to put a diagnosis. But should I proceed again with taking sample, anestesy, the whole thing just to investigate further on Leishmania, even if the blood analysis were negative and this does not exist in my country. Is it possible that my dog took this parasit 6 years ago and it remained inactive in its body for this period of time? If I do again this tissue analysis and it comes up as Negative and also they do not identify any other parasits or infection, what should I do next? Thank you.

Hello I notice this bump on the back leg of my Aussie shepherd anyone know what this might be