It could possibly be Lupus.
rash on upper back arms
The upper arm is part of an arm and therefore there are no complete arms in the upper arm.
slightly raised, scaly-edged round or oval pink-copper colored spots on the trunk and upper arms. The spots, which have a wrinkled center and a sharp border, sometimes resemble a Christmas tree.
Arms
The Venezuelan flag has an optional coat of arms in the upper left hand corner on which is a white horse.
the upper extremities are your arms.
Arms
It's Upper Austria.
An "extremity" refers to your limbs (arms and legs). Lower extremities are your legs; upper extremities are your arms.
The Venezuelan flag has an optional coat of arms in the upper left hand corner. It sits upon a white horse.
The Slovenian flag has horizontal stripes of red, blue, and white, with an emblem in the upper right corner. Its coat of arms has similar colors.
The upper arm, from shoulder to elbow, is the brachium. The lower arm, from elbow to wrist, is the antebrachium.