Hi, thanks for sharing your health concerns with HCM!
If someone comes to me with a non-mobile painless lump, my first and foremost reflex to your question would be "CAUTION" as for this case of hand lump, I would come up with three possibilities, these include:
1. a neoplastic or malignant
tumor could be cancer!
2. The second possibility is of a benign bony lesion like
osteoma or osteochondroma or dermatofibroma!
3. The last possibility is of some normal / developmental nodule like muscular nodule or just a feeling for you!
Overall, it should not be neglected but you could go for FNAC test /
CT scan of chest for confirmation before consulting a surgeon in your area!
Hope this answers your question. If you have additional questions or follow up questions then please do not hesitate in writing to us. I will be happy to answer your questions.
Wishing you good health.