Afternoon all, I’m being treated for plantar fasciitis in bo

Afternoon all, I’m being treated for plantar fasciitis in both feet, and the orthotics are slowly working. However I told the podiatrist the separate pain in this area isn’t getting any better. Today I had an ultrasound on this area and straight away he goes “oh this black thing is weird”. Turns out I have a ganglion cyst in the area circled, measuring 20mm (length), x 6mm (height), x 18mm (width). Is this termed a big or small ganglion? What is the treatment for such a thing