Thanks for posting your query.
From the symptoms that you have described, it can be a cyst (digital mucus cyst) or an epidermoid cyst. Both are harmless and you should not worry about them. However if they become painful then it means that they are infected and then they may be removed.
If it is hard, then it can be a wart or a callus. Warts are contagious but the rest of the conditions are non contagious.
You need to get it examined from a dermatologist. A dermatologist can tell whether you have a wart by looking at it. In rare cases, a dermatologist may need to perform a skin biopsy to be certain.
Hope that this information helps and hope that you will get better soon. Wishing you good health.
I wasn't sure if this case was a suitable for a post in there - but I will make a post just to make sure!
Thank you very much.
Have you considered asking in the surgical area for a hand surgeon to answer?
Hi there Diane,
Thanks for the response, and after searching images of the cysts, I can say that it is similar to that, only my condition appears more like dead skin. It's dimensions across my thumb joint are about 1cm by 1cm, and had one large solid mass of hard skin above it. the hard skin still has the "Thumb wrinkles", only they are where the cracks form if I bend my thumb too much which causes me a lot of pain.
Any other ideas?
Look up images of Gangloin cyst on thumb and see if that fits. The squishy feel would be synovial fluid build up.