Talk to Dermatologist on Foot Wart/corn

Firstly, I applied corn cap for 7 days. The first thick layer got removed. Afterward, I got swelling around area and visited a dermatologist. He advised me to use Collomak solution and second layer got removed after a few days of using this solution. Now, this is a thick hard white layer with small holes. Should I keep using collomak on this layer as well? I am already using it on this layer from the last 6 days (twice a day) but this layer is not going anywhere. Sometimes I notice swelling on my foot and feel like pinching and pain under this white part. The pictures are attached. I will be really thankful if I will get any help from this forum. Thank you