There is a blister on the sole of the foot. It doesn't hurt or itch. It's hard. It's small at first. It's been more than a year. Later, it's found that it's getting bigger and bigger, but there's no other discomfort, it's not red or swollen, just like a cocoon
According to the two pictures you sent and the symptoms you described, I think this is likely to be a manifestation of wart, that is, caused by a virus infection. In this case, it is necessary to go to the dermatology department of the hospital for laser cryosurgery as soon as possible to have a certain effect, and other treatment effects may not be ideal
When the clinical pathological changes of herpes appear in the local tissue of the sole of the foot, it is the state reaction of the body caused by local tissue infection and stimulation injury. After the hospital inspection and confirmation, it is adjusted and treated through the local medication of anti infection personal care.
Like a bubble growing out of the sole of the foot, although it does not hurt or itch, it will be in a constant change, which will lead to relatively hard. This situation is called a leather needle. For this situation, it should be softened, improved and removed by ointment