Gently flex the leg out (if you can without causing pain). . leg mites are the most likely parasites to cause limping and lameness in growing and adult poultry.
Chicks can develop leg and toe problems for any number of reasons. .. of ailments and issues that afflict adult chickens legs and feet here.
Two common chicken foot problems and leg ailments are leg mites and bumblefoot, both of which are easy to treat. Less common, but.