Dear friend,thank you for your consultation.see sometimes in the low back area due to fungal infection a discoloration like splotchy occurs.you under the supervision of your dermatologist can apply steroid cream.and independently a low back pain is also very much common among our patients.for that you should start doing regular physiotherapy for strengthening back muscles; like flexion exercise.but remember these two signs ,if started simultaneously ,then you should go for a detailed clinical examination and added x-ray and ultrasonography of that region.these complete evaluation will really help you to know the real cause of your said symptoms.I sincerely believe you will be ok in coming days.my best wishes.thank you.