Lupus skin rash from sun exposure These rashes form from ... If you have small black spots on your fingers or toes, let your doctor know right away. Color changes in fingers and toes.

The condition causes small areas of skin on the feet and hands to become swollen, itchy and painful, the Mayo Clinic says. The affected areas may also blister and become temporarily discolored.

"These are fixed, small, painful, sometimes itchy oval blisters that develop on the hands, feet and the inside of the mouth," ...