Skin discoloration - D/D

Pigmentation in lip since 4 months. 1. What history to be asked. 2. Possible cause. 3. Treatment if possible.

61 y/o Male with rash starting on foot in summer. Initially responded to methylprednisone and PO steroid taper starting at 50mg and doxycycline. Rash recurred with the diffuse spread. Rash recurred with diffuse spread and improved some to repeat PO steroid taper and doxy. What is the diagnosis and treatment options?

45 years woman, increasing Scar over face. Advice the treatment

a man 45yrs old has rash nape of neck increasing with exposure to sun, not diabetic. itching increasing with each exposure to sun light. applies henna but not directly related.Dx & Rx.

A 27 year old male presented with these lesions over the body. he had ibuprofen for bodyache. Dx mx?