Always wear sunscreen daily! Pigmentation will worsen or keep reoccurring without proper sun protection.
Brighten and fade sun spots and post inflammatory acne pigmentation by using an alpha hydroxy acid exfoliating serum like glycolic or lactic acid 2-3 times per week. This can be used interchangeable with a physical exfoliating scrub to smooth and refine the skin's texture.
Use a concentrated Vitamin C serum, or antioxidant rich oil (like seabuckthorn or Graydon's Superfood Serum) which can help brighten and even out skin tone.