Hello! My name is Dr. Aida and I am glad to attend you on Healthcaremagic! The discoloration of the skin could be related to a skin disorder (vitiligo or fungal infection) or vitamin deficiency. For this reason, I recommend consulting with a dermatologist for a physical exam and performing some blood lab tests (complete blood count, iron plasma levels, vitamin D plasma levels, etc.). Hope you will find this answer helpful! Kind regards!