###Human: What can cause pain and an associated red colored patch? ###Assistant: Hi. I have read your query. I have seen the attached photographs (attachment removed to protect patient identity) also. I understand your concern. The possibilities for the red patch on your back are lichen simplex chronicus and tinea corporis. Lichen simplex chronicus is characterized by hyperpigmented patch with roughened skin. Tinea corporis is a fungal infection of skin and characterized by red colored scaly rash. Treatment depends on the diagnosis: For back pain you visit an internal medicine specialist in person for physical evaluation.