Located in the back of the knee, exactly where the skin
folds. Started as 6mm, now around 13mm in diameter. Affected
skin got very thick. Goes from brown to extreme red when it itches, very uncomfortable. It starts itching when knee is bent and skin folds, by sweat, stress or when clothes touch the area. Did tests on biopsy to rule out other diseses, MD diagnosed it as a reactive dermatitis.