Plantar Fibroma - any experiences?

Very recently have had the feeling of a hard, uncomfortable lump on the sole of my foot just behind the ball of the foot which has all the symptoms of Plantar Fibroma (not  been to a GP or podiatrist yet).  I first noticed it in a new pair of shoes but increasingly have been feeling it when wearing my older well-worn shoes and trainers.

Anyone else experience this, and any tips for reducing discomfort? I enjoy hill-walking and don't want this to restrict this as I've already limited my cycling due to some knee problems.