You are going to need more than a facewash to help with your issues. Also the attached picture seems to have been taken from a front camera, so it has blurred out the pigmentation. Try to send pictures from the back camera, in natural light and no filters/beauty settings so that we can evaluate you properly.
Next Steps
Consult with a certified dermatologist to get your skin type evaluated and understand your skin concern better.
Health Tips
Wear a sunscreen every 3 hours, in a thick layer on all exposed areas to avoid further tanning.