I am not sure about the actual meaning of lan1 given by casey.dict give si-bah for anoher word for it
callus 骨痂 bony matter which unites the ends of fractured bones
胼胝 tylosis a thick,hard place on the skin.
I think I was wrong about callus as bony matter .It is callus for hard-thickening of skin in hand.corn is for those appear in leg/toe due to pressure of shoes.
In mandarin it is 茧,老茧 ,趼子,老趼,膙子,胼胝,鸡眼.all are lan in minnan.