Hello,
I cannot confirm anything without examination but it can be due to callus, friction blisters, warts or herpetic sores. When a
foot is hot and sweaty, the sock sticks to the
foot. The sock and
foot then rub against each other and the inside of the shoe causing blisters to appear.Plantar fibromas are firm, nodular masses which occur as a single mass or in clusters on the arches of the foot.
Wear shoes that fit properly and keep feet as dry as possible.