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Blisters (finger): There are almost limitless causes of blisters on the finger. Course contact dermatitis is the most obvious cause especially if you have any rash anywhere else, but there are such strange things is herpes zoster appearing first i'm just a single finger, which we've seen many times.
Types. A number of causes are related to bumps on the finger joint. One common and harmless cause is a ganglion cyst, which is a harmless, fluid-filled growth, according to MayoClinic.com. Inflammation from arthritis also can cause bumps on the finger to develop.If rheumatoid arthritis causes the bump, it is known as a Bouchard's node, according to eOrthopod. If osteoarthritis causes the bump, it is known as a Heberden's node.ypes. A number of causes are related to bumps on the finger joint. One common and harmless cause is a ganglion cyst, which is a harmless, fluid-filled growth, according to MayoClinic.com. Inflammation from arthritis also can cause bumps on the finger to develop.