“Fibrodysplasia ossificans progressiva (FOP) is a genetic condition where people are born with bunions and their body’s muscle tissue and connective tissues, like tendons and ligaments, turn into bone on the outside of their skeleton. This condition restricts movement and can cause a loss of mobility over time in people diagnosed with the condition.”

Cleveland Clinic (https://my.clevelandclinic.org/health/diseases/24476-fibrodysplasia-ossificans-progressiva”)