I have been diagnosed with lupus and related autoimmune issues but my symptoms are very mild and treated with plaquanil. Last week a knuckle on my right middle finger turned purple as though it was badly bruised. There is a somewhat hard white spot on the side of my finger, which is slightly raised and very slightly tender. I showed it to my rheumatologist. She didn't know what it was but suggested that I had spontaneously broken a blood vessel. She said if it didn't get better within a week I should follow up with her, but since she doesn't seem to have any idea what the problem is, I am wondering if I should check with a dermatologist or a hematologist. Any ideas