Rafti hello here is the answer to your question; Differences between pityriasis versicolor and vitiligo Pityriasis versicolor can sometimes be confused with vitiligo, as they both cause the skin to become discoloured in patches.
But there are ways to tell the difference:
vitiligo often develops symmetrically (on both sides of your body at the same time), while pityriasis versicolor may not
skin affected by vitiligo usually has a normal texture, while areas affected by pityriasis versicolor are usually slightly scaly or flaky vitiligo is more common around the mouth, eyes, fingers, wrists, armpits and groin, while pityriasis versicolor tends to develop on the back, chest, upper arms, neck and tummy. This information can be found on this website: https://www.nidirect.gov.uk/conditions/pityrias...

Pityriasis versicolor

https://www.nidirect.gov.uk/conditions/pityriasis-versicolor