We would need a lot more specific information before anyone can help. How long have you had him? What specific type of lighting are you using (and I mean brands)? What are you feeding, and what do you dust and gutload the feeder insects with? How often do you apply dusts? What is the cage setup like and what are the temp ranges (day to night), and the cage humidity (percent range from high to low)?

If this is something that has come on gradually, it may be a nutritional deficiency and all the info I've asked for will be important to figure out what is wrong. The lump on the leg could be a fracture caused by metabolic bone disease. The weak grip, lethargy could also be caused by this. But without knowing what you feed, dust, and what lighting you use, there's no way to tell.

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