SKIN PROBLEMS/DISEASES Pigmentation/Tan/DarkeningPatches/Acne skinproblems/diseases,pigmentation,tan,darkening patches,acne Include all conditions that irritate, enlarged pores , or damage your skin, as well as skin cancer. You may inherit a skin problem or be diagnosed with a skin disease. Many skin conditions cause itching, dry skin or rashes , acne , pigmentation . Often,