I would like to know more regarding my diagnosis of reticular erythmatosis mucinosis (rem disease). i have been told its a rare skin disease. ?

It is rare: Reticular erythematous mucinosis (rem) syndrome is a rare skin disease that predominantly affects the chest area of middle-aged women. The cause is unknown. However, exposure to sunlight may contribute to the condition. Treatment includes: little exposure to sun, antimalarial tablets, topical and/or oral corticosteroids, or even pulsed dye. I hope this helped :].