<s>[INST] Hi I am 20 years old and I weigh 120pounds.I have developed a small lump on my left n right shin same spot,like 2 to 3 inches below my knee.they are painless,it does not hurt when I jump or run.I am wondering what this could be.and maybe it does not hurt since it might barely be starting [/INST] Hi.Thanks for your query, albeit short and specific.The development of painless lumps on shin of tibia at the same spots can be due to a condition called exostosis.This is a familial disease.Benign in nature and have to be kept under observation.Needs no active treatment at the moment. </s>