Afternoon all, I’m being treated for plantar fasciitis in both feet, and the orthotics are slowly working.

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