Do not use harsh home remedies (pure lemon, vinegar) without supervision → they can cause further irritation.
In summary: white patches are usually benign (guttate hypomelanosis due to sun exposure/age, pityriasis versicolor due to fungus, pityriasis alba due to dryness/atopy), but vitiligo and other autoimmune causes require accurate diagnosis. If you are concerned about them or they are changing, a dermatologist can easily identify them (sometimes with Wood’s lamp or biopsy) and advise you on treatments (creams, phototherapy, etc.).
Are the spots small and scattered on arms/legs, or larger and on the face/hands? Are they itchy or scaly? Tell me more details so I can give you a more accurate picture
